{"id":4198,"date":"2025-10-15T09:35:20","date_gmt":"2025-10-15T04:05:20","guid":{"rendered":"https:\/\/vajiramandravi.com\/upsc-exam\/?p=4198"},"modified":"2025-10-17T16:00:20","modified_gmt":"2025-10-17T10:30:20","slug":"solutions","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/upsc-exam\/solutions\/","title":{"rendered":"Solutions, Types, Properties and Examples, UPSC Notes"},"content":{"rendered":"<p>A solution is a\u00a0<strong>homogeneous mixture<\/strong>\u00a0of two or more components. A homogeneous mixture has the same composition throughout. A solution consists of a solvent and a solute. Solutions are a part of our everyday lives as they can be found in almost everything that we use, such as soda, deodorant, sugar, salt, and so on. It encompasses a diverse array of mixtures, each distinguished by unique characteristics and properties.<\/p>\r\n<h2>Solutions<\/h2>\r\n<p>Solutions are homogeneous mixtures of two or more constituents with uniform composition and properties throughout.<\/p>\r\n<ul>\r\n\t<li>For example, sugar in water or salt in water solutions. These solutions are called homogenous solutions or true solutions.<\/li>\r\n<\/ul>\r\n<h3>Components of Solution<\/h3>\r\n<p>A solution comprises a solvent (major component) and a solute (minor component).<\/p>\r\n<ul>\r\n\t<li><strong>Solute:\u00a0<\/strong>The solute is the component of the solution that\u00a0<strong>dissolves in the other component (solvent)<\/strong>. In general, the solute concentration is low in comparison to the solvent concentration.<\/li>\r\n\t<li><strong>Solvent:<\/strong>\u00a0The solvent is the component of a solution that\u00a0<strong>dissolves a solute<\/strong>. Solvents are typically liquids or gases. In comparison to the concentration of solute, the concentration of solvent is high.<\/li>\r\n\t<li><strong>Example:\u00a0<\/strong>Sugar syrup is a solution made by dissolving sugar in water with heat. Water serves as the solvent, and sugar serves as the solute.<\/li>\r\n<\/ul>\r\n<h2>Properties of Solution<\/h2>\r\n<p>The properties of solutions are fundamental characteristics that distinguish them from other types of mixtures.<\/p>\r\n<ul>\r\n\t<li><strong>Homogeneity:\u00a0<\/strong>Solutions are uniform throughout, with consistent composition and properties. At a molecular level, the solute particles are evenly distributed within the solvent.<\/li>\r\n\t<li><strong>Stability:\u00a0<\/strong>Solutions maintain their properties over time, remaining in a well-mixed state without separating the components. They don't settle in or undergo noticeable changes easily.<\/li>\r\n\t<li><strong>Composition consistency:<\/strong>\u00a0The composition of a solution remains constant throughout the mixture. This means that the solute-to-solvent ratio remains constant regardless of the amount of solution present.<\/li>\r\n\t<li><strong>Particle size:\u00a0<\/strong>The dissolved particles are extremely small, typically less than 1 nm in diameter. The particles cannot be seen with the naked eye.<\/li>\r\n\t<li><strong>Filtration:\u00a0<\/strong>Because the solute particles in the solutions are so small, they easily pass through the filter paper. As a result, filtration cannot separate solution components.<\/li>\r\n\t<li><strong>Scattering:<\/strong>\u00a0Solutions don't scatter light beams that pass through them. Therefore, in solutions, the light beam's path is invisible.<\/li>\r\n<\/ul>\r\n<h2>Types of Solution<\/h2>\r\n<p>Solutions are classified according to various factors, such as the presence of water as a solvent, the amount of solute present, the amount of solvent, and the concentration of solute in two solutions.<\/p>\r\n<h3>Based on Water as the Solvent<\/h3>\r\n<ul>\r\n\t<li><strong>Aqueous solutions:<\/strong>\u00a0These solutions have<strong>\u00a0water as the solvent<\/strong>. They are the most common type of solution and are found in many everyday substances.\r\n\r\n<ul>\r\n\t<li><strong>Examples\u00a0<\/strong>of aqueous solutions include saltwater, coffee, vinegar, sugar water, etc.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Non-aqueous solutions:<\/strong>\u00a0These solutions have a\u00a0<strong>solvent other than water<\/strong>. They are less common than aqueous solutions and are typically found in specialized applications.\r\n\r\n<ul>\r\n\t<li><strong>Examples<\/strong>\u00a0of non-aqueous solutions include alcohol solutions, naphthalene in benzene, sulphur in carbon disulphide etc.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h3>Based on Amount of Solvent<\/h3>\r\n<ul>\r\n\t<li><strong>Dilute solution:<\/strong>\u00a0A dilute solution contains small amounts of solute in a large amount of solvent to form a solution.\r\n\r\n<ul>\r\n\t<li><strong>Examples:\u00a0<\/strong>Salt solution, Vinegar, light-coloured tea, pure lemon juice in water, etc.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Concentrated solutions:<\/strong>\u00a0These solutions have a high concentration of solute. They are considered to be strong and have a relatively large effect on the properties of the solvent.\r\n\r\n<ul>\r\n\t<li><strong>Examples<\/strong>: Brine solution, orange juice, dark-coloured tea<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h3>Based on Amount of Solute<\/h3>\r\n<ul>\r\n\t<li><strong>Unsaturated solutions:<\/strong>\u00a0These solutions contain less solute than the solvent can dissolve at a given temperature. They are considered to be stable and will not precipitate out of the solution.\r\n\r\n<ul>\r\n\t<li><strong>Example<\/strong>: One spoon of sugar in one glass of water.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Saturated solutions:\u00a0<\/strong>These solutions hold the most solute possible at a given temperature, called saturation. At saturation, solute dissolving equals solute precipitating, reaching equilibrium. No more solute can dissolve beyond this point.\r\n\r\n<ul>\r\n\t<li><strong>Example:\u00a0<\/strong>Air saturated with water vapour.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Supersaturated solutions:<\/strong>\u00a0These solutions contain more solute than the solvent can dissolve at a given temperature. They are considered to be unstable and will eventually precipitate out of the solution.\r\n\r\n<ul>\r\n\t<li><strong>Example:<\/strong>\u00a0Carbonated water<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h3>Based on Concentration of Solute in Two Solutions<\/h3>\r\n<ul>\r\n\t<li><strong>Isotonic solutions:\u00a0<\/strong>These solutions have the same osmotic pressure as the surrounding environment. These solutions have a higher concentration of solute in it.\r\n\r\n<ul>\r\n\t<li><strong>Examples:<\/strong>\u00a0Isotonic energy drinks, normal saline (0.9% NaCl solution) etc.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Hypotonic solutions:\u00a0<\/strong>These solutions have a lower osmotic pressure than the surrounding environment. The solution contains a lower concentration of solute.\r\n\r\n<ul>\r\n\t<li><strong>Examples<\/strong>: Pure water, distilled water etc.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Hypertonic solutions:<\/strong>\u00a0These solutions have a higher osmotic pressure than the surrounding environment. These solutions have the same solute concentration.\r\n\r\n<ul>\r\n\t<li><strong>Examples<\/strong>: Saltwater, corn syrup etc.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h3>Based on the Physical State of the Solute and Solvent<\/h3>\r\n<p>During the formation of a solution, any state of matter (solid, liquid, or gas) can act as both a solute and a solvent. As a result, these solutions can be categorised into nine different types based on the physical states of the solute and solvent.<\/p>\r\n<figure>\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td class=\"tb-color\"><strong>Types of Solution (Solute-Solvent)<\/strong><\/td>\r\n<td class=\"tb-color\"><strong>Examples<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Solid-solid<\/td>\r\n<td>Alloys like brass, bronze, etc.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Solid-gas<\/td>\r\n<td>Sublimation of substances like iodine, camphor, etc into the air.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Solid-liquid<\/td>\r\n<td>The solution of sugar, salt, etc in water.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Liquid-solid<\/td>\r\n<td>Hydrated salts, mercury in amalgamated zinc, etc.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Liquid-gas<\/td>\r\n<td>Aerosol, water vapour in the air.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Liquid-liquid<\/td>\r\n<td>Alcohol in water, benzene in toluene<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Gas-solid<\/td>\r\n<td>Hydrogen absorbed in palladium<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Gas-gas<\/td>\r\n<td>A mixture of gases, etc<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Gas-liquid<\/td>\r\n<td>Aerated drinks<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<h2>Heterogenous Solutions<\/h2>\r\n<p>While the above solutions are a homogenous mixture in nature, there are some heterogenous solutions. They typically have larger sizes than the true solutions.<\/p>\r\n<h3>Colloidal Solutions<\/h3>\r\n<p>Colloidal solutions are also heterogeneous mixtures\u00a0<strong>but appear to be homogenous<\/strong>\u00a0as the particles of the solute are larger than those in true solutions.<\/p>\r\n<ul>\r\n\t<li><strong>Properties of colloidal solutions:<\/strong>\r\n<ul>\r\n\t<li><strong>Particle size:<\/strong>\u00a0Colloidal particles are small (between 1 nm to 1000 nm), too tiny to be seen individually with the naked eye but large enough to scatter light (exhibiting the Tyndall effect).<\/li>\r\n\t<li><strong>Homogeneity and Heterogeneity:<\/strong>\u00a0While a colloidal solution appears homogeneous due to the small size of particles, it is heterogeneous.<\/li>\r\n\t<li><strong>Stability:<\/strong>\u00a0Colloids remain stable over time, do not settle down when left undisturbed, and resist gravitational forces.<\/li>\r\n\t<li><strong>Filtration:<\/strong>\u00a0Colloidal particles cannot be easily filtered out but can be separated using specialised techniques like centrifugation.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Examples of colloidal solutions:<\/strong>\r\n<ul>\r\n\t<li><strong>Milk:<\/strong>\u00a0Fat particles (solute) dispersed in water (solvent)<\/li>\r\n\t<li><strong>Fog:\u00a0<\/strong>Water droplets (solute) dispersed in the air (solvent)<\/li>\r\n\t<li><strong>Paint:\u00a0<\/strong>Pigment particles (solute) dispersed in a liquid medium (solvent)<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Classification of colloidal solutions:\u00a0<\/strong>\r\n<ul>\r\n\t<li><strong>The dispersed phase\u00a0<\/strong>(solute-like particles) and the\u00a0<strong>dispersion medium\u00a0<\/strong>(where the dispersed phase is suspended).<\/li>\r\n\t<li>Colloids are categorized by the state of the dispersion medium and the dispersed phase.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h3>Suspensions<\/h3>\r\n<p>A suspension is a heterogeneous mixture where solute particles do not dissolve but remain suspended.<\/p>\r\n<ul>\r\n\t<li><strong>Properties of suspensions:<\/strong>\r\n<ul>\r\n\t<li><strong>Heterogeneous mixture:<\/strong>\u00a0The composition in a suspension is not uniform. The solid particles are suspended throughout the liquid, but they are not dissolved in it.<\/li>\r\n\t<li><strong>Large particles:<\/strong>\u00a0The particles of a suspension are large (greater than 1000 nm) enough as compared to true and colloidal solutions that they can be seen with the naked eye.<\/li>\r\n\t<li><strong>Scattering of light:\u00a0<\/strong>The suspended particles are large enough to be seen individually and can scatter a beam of light, making its path visible (demonstrating the Tyndall effect).<\/li>\r\n\t<li><strong>Settling:<\/strong>\u00a0When left undisturbed, the solute particles settle at the bottom of the container due to gravity, making suspensions unstable.<\/li>\r\n\t<li><strong>Filtration:<\/strong>\u00a0Suspended particles can be separated from the mixture by filtration. Once settled, the suspension loses its scattering ability and becomes clearer.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t<li><strong>Examples of suspensions:<\/strong>\r\n<ul>\r\n\t<li><strong>Muddy Water:<\/strong>\u00a0Dirt or soil particles suspended in water.<\/li>\r\n\t<li><strong>Chalk in Water<\/strong>: Suspended chalk particles in water.<\/li>\r\n\t<li><strong>Paints:\u00a0<\/strong>Paints consist of pigments suspended in a liquid medium.<\/li>\r\n\t<li><strong>Blood:<\/strong>\u00a0Red and white blood cells, and lymphocytes suspended in plasma<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>A solution is a homogeneous mixture of two or more components, which consist of solute and solvent. The solute is dissolved into the solvent.<\/p>\n","protected":false},"author":6,"featured_media":8103,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[173],"tags":[40,192],"class_list":{"0":"post-4198","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-quest-level-3","8":"tag-quest","9":"tag-solutions"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4198","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/comments?post=4198"}],"version-history":[{"count":1,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4198\/revisions"}],"predecessor-version":[{"id":19978,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4198\/revisions\/19978"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media\/8103"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media?parent=4198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/categories?post=4198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/tags?post=4198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}