pH Scale

IMPORTANT

pH Scale: Overview

This topic covers concepts, such as, pH Scale, Expression for pH, Expression for pOH, Relation between pH and pOH, Calibration of pH Scale, pH Values of Common Substances, Calculation of pH of solutions & Limitations of pH Scale etc.

Important Questions on pH Scale

MEDIUM
IMPORTANT

1 M NaCl and 1 M HCl are present in an aqueous solution. The solution is –

EASY
IMPORTANT

Hydrogen ion concentration will increase with the increase in temperature.

EASY
IMPORTANT

Write a limitation of pH scale in terms of a very low concentrated acid.

EASY
IMPORTANT

The pH value of 1 N solution of a strong acid is zero, so if the concentrations will be 2N, 3N, 10 N etc, then the pH value will be _____.

EASY
IMPORTANT

The H+ ion concentration of a solution pH=1 will be three-time of the H+ ion concentration of another solutionpH=3.

EASY
IMPORTANT

The pH value of an acid of concentration 10-8 N will be

MEDIUM
IMPORTANT

Wtite the limitations of pH scale.

MEDIUM
IMPORTANT

Which of the following gas the highest pH at 25°C ?

HARD
IMPORTANT

The equilibrium constant for the ionization of RNH2(g) in water is 8×10-6 at 2 5 C  .

RNH2g+H2OlRNH3+aq+OH-aq

Find the pH of a solution at equilibrium when the pressure of RNH2(g) is 0.5 bar.

MEDIUM
IMPORTANT

If the H+ ion concentration in the blood pH=7.36 is x  times greater than that in the spinal fluid pH=7.53, Round off the value of x  to one decimal and report the value of 2x

EASY
IMPORTANT

If the hydroxide ion concentration of a solution of  pH  6.2 is A X10-8

Report the value of A by multiplying with10 and rounding off to two significant figures.

MEDIUM
IMPORTANT

The pH of 0.001 M BaOH2 solution will be _____.

MEDIUM
IMPORTANT

The pH of 0.001 M BaOH2 solution will be

MEDIUM
IMPORTANT

When rain is accompanied by a thunderstorm, the collected rain water will have pH value

EASY
IMPORTANT

How many times a 0.1 M strong monobasic acid solution should be diluted so that pH of the resulting solution is tripled?

MEDIUM
IMPORTANT

The pH of distilled water is _____.

EASY
IMPORTANT

Which of the following statements are correct regarding the acidic and basic solutions?

HARD
IMPORTANT

Find the pH of the solution, when 100 mL of 0.10 M NaOH is mixed with 100 ml of 0.05 M CH3COOH solution. 

HARD
IMPORTANT

 40 mL of oxalic acid reacts with 16 mL of 0.05M acidified KMnO4. What is the pH of x M oxalic acid solution? (Assume that oxalic acid dissociates completely).

MEDIUM
IMPORTANT

On mixing x ml of H2O, the  pH of 1 ml of a strong monobasic acid increases by 1 unit .  The value of x is: