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

Bases are number - on the pH scale.

  1. 0-14

  2. 8-14

  3. 7

  4. 0-6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

On the pH scale, bases (alkaline substances) have pH values greater than 7, ranging from 8 to 14. A pH of 7 is neutral, and pH values from 0 to 6 represent acids.

Multiple choice

Acids are numbers - on the pH scale.

  1. 0-6

  2. 8-14

  3. 0-7

  4. 7-14
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

On the pH scale, acids have pH values less than 7, ranging from 0 to 6. A pH of 7 is neutral, and pH values from 8 to 14 represent bases.

Multiple choice

H20= neutral. Its pH is 7. Lemon juice is put in H20. pH= less than 7; litmus paper turns red.

  1. The lemon juice is a salt.

  2. The lemon juice is a base.

  3. The lemon juice is an acid.

  4. The lemon juice is neutral.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Acids are characterized by having a pH value of less than 7 and turning blue litmus paper red. Since adding lemon juice to water results in a pH below 7 and turns the litmus paper red, lemon juice is classified as an acid.

Multiple choice

What is the Ph value of human blood?

  1. 7.4

  2. 7

  3. 0

  4. 8
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Human blood is slightly basic, with a normal pH range of approximately 7.35 to 7.45, making 7.4 the correct representative value.

Multiple choice chemistry amines introduction to diazonium salts structure, preparation and physical properties of diazonium salts diazonium salts
What is the molarity of 0.2 N Na2 CO3 solution ?

  1. 0.1M

  2. 0M

  3. 0.4M

  4. 0.2M
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Normality is equal to molarity multiplied by the n-factor. For sodium carbonate (Na2CO3), the n-factor is 2 because it dissociates to release two sodium ions. Thus, a 0.2 N solution has a molarity of 0.2 / 2 = 0.1 M.

Multiple choice

pH is a measure of

  1. proportion of protons

  2. proportion of neutrons

  3. proportion of electrons

  4. proportion of dipoles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pH scale is a logarithmic measure of the concentration of hydrogen ions (H+) in a solution. Since a hydrogen ion is simply a single proton, pH directly measures the proportion of protons. Neutrons, electrons, and dipoles do not determine the acidity or basicity of a solution.

Multiple choice

Stomach acid is about pH

  1. 3

  2. 5

  3. 7

  4. 9
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stomach acid, which consists primarily of hydrochloric acid, is highly acidic with a typical pH ranging from 1.5 to 3.5. A pH of 3 is the only option that represents this highly acidic environment. A pH of 7 is neutral, while 9 is basic.

Multiple choice

RQ of Oxalic acid

  1. 0.8 - 0.9

  2. 4

  3. 0.71

  4. 1.3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxalic acid is an organic acid with a high oxygen content relative to carbon, resulting in a high Respiratory Quotient (RQ) of 4.0.

Multiple choice

RQ of malic acid

  1. 0.8 - 0.9

  2. 4

  3. 0.71

  4. 1.3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Malic acid is an organic acid that, when oxidized, yields an Respiratory Quotient (RQ) of 1.33.

Multiple choice

An acidic solution has

  1. a greater concentration of OH-

  2. a greater concentration of H+ ions.

  3. equal concentration of H+ and OH-
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

By definition, an acidic solution has a higher concentration of hydrogen ions (H+) compared to hydroxide ions (OH-).

Multiple choice

Bases have a pH

  1. greater than 7

  2. equal to 7

  3. less than 7
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pH scale ranges from 0 to 14. Solutions with a pH less than 7 are acidic, a pH of 7 is neutral, and a pH greater than 7 is basic (alkaline).

Multiple choice

The pH scale is

  1. a linear scale

  2. an exponential scale

  3. a logarithmic scale
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pH scale is defined as the negative logarithm of the hydrogen ion concentration. Therefore, it is a logarithmic scale, meaning each unit change represents a tenfold change in ion concentration.