Chemistry

Solutions and pH Chemistry

451 Questions

Solutions and pH chemistry focus on the acidity or alkalinity of various substances, from human urine to acidic soils. Questions involve titration calculations, molarity determination, and understanding mole fractions. This topic is a staple in the chemistry sections of state and national level competitive exams.

Calculating solution molarityMole fraction calculationpH value interpretationAcidic soils and pHTitration and neutralization

Solutions and pH Chemistry Questions

Multiple choice

pH value of pure water is

  1. 7.5

  2. 7

  3. 6.5

  4. 6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pure water is neutral and has a pH value of 7 at 25 degrees Celsius.

Multiple choice

What is the pH value of acidic solution?

  1. Less than 7

  2. More than 7

  3. Exact 7

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An acidic solution has a higher concentration of hydrogen ions, which corresponds to a pH value of less than 7 on the pH scale.

Multiple choice

The pH value of a weak acid is

  1. 9

  2. 1

  3. 7

  4. 5

  5. 14
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pH of the solution is a measure of the replaceable hydrogen ions present in it.  The larger the value of pH, the lesser is the amount of hydrogen ions and less acidic is the solution. Hence, solution with pH 5 denotes a weak acid.   

Multiple choice

The normal Ph of the human blood is _____.

  1. 7.12

  2. 7.23

  3. 7.45

  4. 7.34
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The normal pH range for human arterial blood is tightly regulated between 7.35 and 7.45. Among the choices, 7.45 is the only value within the physiological range.

Multiple choice

The pH of acid rain is

  1. below 5.6

  2. above 5.6

  3. below 6.5

  4. above 6.5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pH of acid rain is below 5.6. Acid rain is defined as any rain with a pH value of less than 5.6.

Multiple choice

The alkalinity and the hardness of a water sample are 250 mg/L and 350 mg/L as CaCO3, respectively. The water has

  1. 350 mg/L carbonate hardness and zero non-carbonate hardness

  2. 250 mg/L carbonate hardness and 100 mg/L non-carbonate hardness

  3. 250 mg/L carbonate hardness and 350 mg/L non-carbonate hardness

  4. 250 mg/L carbonate hardness and zero non-carbonate hardness

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Alkalinity and hardness of water sample whichever is lower should be treated as hardness of the water sample as $CaCO_3$. Hence, 250 mg\L carbonate hardness and zero non-carbonate hardness.