NCERT Solutions

Viva Questions with Answers on Experiments Based On pH Change

Viva Questions with Answers on Experiments Based On pH Change. 1. Define pH. Ans. It is defined as the negative logarithm of hydronium ion concentration in moles per litre. pH = – log [H3O+]. 2. What do you mean by pOH ? Ans. It is negative logarithm of OH– ion concentration. pOH = – log [OH–] = 14—pH. 3. What is pH of pure water at 25°C ? Ans. 7. 4.What does pH of a solution signify ? Ans. It…

Effect of Change of Concentration on Chemical Equilibrium

To study the shift of equilibrium between ferric ions and thiocyanate ions

To study the shift of equilibrium between ferric ions and thiocyanate ions by increasing the concentration of either of them. Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers Theory When a system in equilibrium is suddenly disturbed, it will respond in some way until equilibrium is re-established. Consider the equilibrium between ferric ions and thiocyanate ions: The…

Viva Questions with Answers on Effect of Change of Concentration on Chemical Equilibrium

Viva Questions with Answers on Effect of Change of Concentration on Chemical Equilibrium. 1. What is law of mass action ? Ans. The rate at which a chemical substance reacts is directly proportional to its molar concentra¬tion. The rate of reaction is directly proportional to the product of the molar concentrations of the reacting substances. 2. Define reversible reaction and give an example of a…

Quantitative Estimation (Volumetric Analysis)

Quantitative Estimation (Volumetric Analysis) In volumetric analysis, the quantities of the constituents present in the given unknown solution are determined by measuring the volumes of the solutions taking part in the given chemical reaction. The main process of this analysis is called titration which means the determination of the volume of a reagent required to bring a definite reaction to…

Prepare M/10 sodium carbonate solution

Prepare  Oxalic Acid Solution Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers Theory The molecular mass of oxalic acid is 126. In order to prepare oxalic acid solution, 12.6 g of oxalic acid should be dissolved per litre of solution. Alternatively, = 3.15 g of oxalic acid crystals should be dissolved in water and the solution be made exactly 250 ml. Apparatus Weight box,…

Prepare 250 ml of 5N HCl from the given 12N HCl

Prepare 250 ml of 5N from the given 12N To prepare 250 ml of 5N HCl from 12N HCl, the volume of concentrated acid required can be calculated by using the normality equation : N1V1 = N2V2 where, N1 = Normality of concentrated acid = 12 N V1 = Volume of concentrated acid required = ? N2 = Normality of dilute acid to be prepared = 5 N V2 = Volume of dilute acid to be prepared = 250 ml. 12 x V1 = 5 x…

Prepare 250 ml of 2M H2SO4 from the given 18M H2SO4

Prepare 250 ml of 2M from the given 18M Theory To prepare 250 ml of 2M H2SO4 from 18M H2SO4, the volume of concentrated acid required can be calculated by applying molarity equation M1V1 = M2V2 where, M1 = Molarity of concentrated acid = 18M V1 = Volume of concentrated acid required = ? M2 = Molarity of dilute acid to be prepared = 2M V2 = Volume of dilute acid to be prepared = 250 ml 18 x V1 = 2…

Determine the strength of the given sodium hydroxide solution.

Determine the strength of the given sodium hydroxide solution. You are provided with oxalic acid solution. Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers Theory Here, the sodium hydroxide solution is taken in burette and a known volume (20.0 ml) of the oxalic acid solution is taken in the titration flask.The titration is carried out using phenolphthalein as indicator.…

Determine the strength and molarity of the given solution of hydrochloric acid.

Determine the strength and molarity of the given solution of hydrochloric acid. Given is 0.05 M solution. Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers Theory 1. The molarity of hydrochloric acid is determined by titrating it against the standard solution of sodium carbonate using methyl orange as indicator. 2. Strength of the acid is determined by multiplying its molarity…

The given solution contains 6.3 g of hydrated oxalic acid,  crystals per litre. Determine the value of n(no. of molecules of water of crystallisation). Provided 0.1 M Chemical Equation Indicator. Phenolphthalein. End Point. Colourless to light pink (NaOH solution in burette). Procedure 1. Rinse and fill the burette with the given sodium hydroxide solution. 2. Rinse the pipette with the oxalic…

Determine volumetrically the number of water molecules of crystallisation in washing soda

Determine volumetrically, the value of ‘n’ i.e., the number of water molecules of crystallisation in washing soda , 7.0 g of which have been dissolved per litre of the given solution. Provided Chemical Equation: Indicator. Methyl orange. End Point. Yellow to light pink (Acid in burette) Procedure Rinse and fill the burette with the standard HCl solution. Rinse the pipette with the sodium…

Find out the atomic mass of the monovalent alkali metal (M)

You are provided with the solution of a hydrogen carbonate of a monovalent alkali metal (M) with strength equal to 10.0 gms per litre. Find out the atomic mass of the metal (M). Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers Requirement Standard solution of HCl (say M/10 HC1). Theory The formula of metal hydrogen carbonate is MHCO3. This will react with HCl according to the…

Viva Questions with Answers on Quantitative Estimation (Volumetric Analysis)

Viva Questions with Answers on Quantitative Estimation (Volumetric Analysis) Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers 1. Why should weights not be lifted with hand ? Ans. This causes error in the weighing because some matter may be transferred from the hand to the weight. 2. Why is front door of the balance closed during weighing ? Ans. Opening the front door causes…

Qualitative Analysis Analytical chemistry deals with qualitative and quantitative analysis of the substances. In inorganic qualitative analysis, the given compound is analyzed for the radicals, i.e., cation and the anion, that it contains. Physical procedures like noting the colour, smell or taste of the substance have very limited scope because of the corrosive, poisonous nature of the chemical…