1 / 10

Practical no.3 Preparation Of Solutions

Practical no.3 Preparation Of Solutions. Solutions. Homogeneous mixture of two or more substances. The state of being dissolved. Solutions are involved in most chemical reactions,refining & purification, Industrial processing & biological processes .

kitty
Download Presentation

Practical no.3 Preparation Of Solutions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Practical no.3Preparation Of Solutions

  2. Solutions • Homogeneous mixture of two or more substances. • The state of being dissolved. • Solutions are involved in most chemical reactions,refining & purification, Industrial processing & biological processes. • Certainly there is a special place in chemistry for solutions in which water the universal solvent provides the solvent medium.Water is a versatile solvent, it dissolves something of everything and everything of something. • Solution is made up of two parts: • 1. solute • 2. solvent

  3. SOLUTE: A solute is a substance which dissolves in the solvent and losses its physical state to form solution. • The substance or substances that are dissolved (dissolved material) • Example: salts, sugars • SOLVENT: • the substance which has the capability to disperse another substance(solute) in solution.

  4. That substance that holds another substance in a solution. • Or the substance which dissolves the solute(dissolving medium). • Most solutions are liquid but can be solid or gases. • In solutions comprising a solid dissolved in a liquid, the liquid is the solvent and solid is solute. • If both components are liquid the one present in smaller amount is usually considered as solute. • One of the most important solutions in world,infact, is the air we breath,a combination of nitrogen,oxygen,noble gases,CO2 & water vapours.

  5. CONCENTRATION • The proportion of solute to solvent in a given solution is expressed by the Concentration of solution. • Defined as “the amount of solute present in the given quantity of the solution” • Concentration of solutions are expressed by four ways: 1. Percent solutions 2. Molar solutions 3. Molal solutions 4. Normal solutions

  6. PERCENT SOLUTIONS • Three ways of expressing percentage composition of a solution: • Weight by weight percent(w/w): It is weight of solute dissolved in 100g of solution. A 20% w/w solution contains 20g solute dissolved in 80g of solvent. Weight by volume percent(w/v): It is weight of solute dissolved in 100ml of solution. A 20% w/v solution contains 20g of solute dissolved in final volume of 100ml solution.

  7. Volume by volume percent(v/v): It is volume of solute dissolved in 100ml of solution. A 20% v/v solution contains 20ml of solute dissolved in a final volume of 100ml solution.

  8. Molar Solutions(M) • MOLARITY: It is the number of moles of the solute dissolved per litre of the solution. • Unit: moles per litre(mol/L) • Formula: Moles of solute Litres of solution A molar solution contains 1g mole of the solute dissolved in 1 L of the solution.

  9. MOLAL SOLUTIONS • MOLALITY: It is number of moles of solute dissolved in 1000g of solvent. • A solution prepared by dissolving 180.16g of glucosein 1000g i.e 1L of water is 1 molal(1m). • Unit: mole per kg of solvent • Formula: moles of solute kg of solvent

  10. NORMAL SOLUTIONS • NORMALITY: It is the number of gram equivalent of the solute dissolved in 1 litre of the solution. • Since equivalent weight= Molecular weight Valency in case of monovalent substance, mol wt= eq. wt M = N When valency is higher than one M = N x Valency

More Related