Dilution

Q.

Which one of the following has a higher concentration of $H^{+}$ ions?

1. 1M HCl

2. 1M

3. Both 1M HCl and 1M

4. CH₃CH₂COOH

Q.

Which type of solution contains less amount of solute in the solution?

1. Concentrated solution

2. Dilute solution

3. Aqueous solution

4. Non-aqueous solution

Q.

The reaction of dissociation of potassium hydroxide which is a strong base in aqueous solution is:

1. KOH + H₂O → H⁺ + KO^- + H₂O

2. KOH + H₂O → H₃O⁺ + KO^-

3. KOH_(aq) → K⁺ + OH^-

4. KOH + H₂O → K⁺ + OH^-

Q. Dilution is the process of decreasing the concentration of a ___ in a solution, usually by mixing more solvent.

Q.

A solution has been prepared by mixing $8.5\mathrm{mL}$ of ethanol with $80\mathrm{mL}$ of water. Calculate the volume percentage of the solution.

Q. What is the difference between concentrated, aqueous and dilute solution?

Q. Question 5
How is the concentration of hydronium ions $\left({\text{H}}_3{\text{O}}^{+}\right)$ affected when a solution of an acid is diluted?

Q.

3. What is saturated solution? How can you prepare it? What is the effect of temperature on the solubility of saturated solution?

Q. Choose the correct statements from the options given below.

1. Concentrated acid has less concentration of water than that of a diluted acid
2. Concentrated acid has more ${\text{H}}^{+}\text{(aq)}$ ions than that of a diluted acid.
3. Concentrated acid is more acidic than the diluted acid.
4. Concentrated acid is less acidic than the diluted acid.

Q.

Are hydrogen bonds weak?

Q.

Why is water not added to concentrated $H_{2}S{O}_4$ in order to dilute it ?

Q. From the list of the substances given, name the substances which you would use to prepare each of the following salts:
List of substances: copper, lead, sodium, zinc, copper oxide, lead carbonate, sodium carbonate solution, dilute hydrochloric acid, dilute nitric acid and dilute sulphuric acid.
Salts: (a) zinc sulphate (b) copper sulphate (c) sodium sulphate (d) lead sulphate.

Q. Name: ​ (i) a salt whose solubility increases with temperature​

Q.

We should never add water to acid because:

1. The reaction is exothermic

2. The reaction is slow

3. The reaction is endothermic

4. The reaction doesn't take place

Q.

Why is the concentrated acid added into water and not water into the acid, while preparing a dilute solution of an acid?

Q.

How is the concentration of $H_3{O}^{+}$ ions affected when an acid is diluted?

Q.

A solution in which some more solute can be dissolved at any fixed temperature is called __ solution

Q. For dilution of concentrated acid, we should add:

1. water into concentrated acid.
2. concentrated acid into water.
3. first water into acid and then more acid.
4. first water into acid and then more water.

Q. Question 5
How is the concentration of hydronium ions $\left({\text{H}}_3{\text{O}}^{+}\right)$ affected when a solution of an acid is diluted?

Q.

Reactions in which sulphuric acid is used as a dehydrating agent are endothermic by nature.

Q. For dilution of concentrated acid, we should add:

1. water into concentrated acid.
2. concentrated acid into water.
3. first water into acid and then more acid.
4. first water into acid and then more water.

Q. While dilution, water is added to the acid.

1. True
2. False

Q. Dilution is the process of decreasing the concentration of a ___ in a solution, usually by mixing more solvent.

Q.

Question 16.
Which of the following phenomena occur, when a small amount of acid is added to water?
(i) Ionisation
(ii) Neutralisation
(iii) Dilution
(iv) Formation

Choose the correct option from the following:
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)

Q. In which option can dilution be said to have occurred?
i) Evaporating NaCl solution to make it very concentrated
ii) Adding water to a $10\%CuS{O}_4$ solution to make it a $1\%$ solution
iii) Adding concentrated sulphuric acid to water

1. i) and ii)
2. ii) and iii)
3. i) and iii)
4. iii)

Q.

The base of the beaker gets heated when water is added to concentrated sulphuric acid as the reaction is:

1. Neutralization
2. Exothermic
3. Endothermic
4. Oxidation

Q. The process of dissolving an acid or a base in water is a/an __________ reaction.

1. exothermic
2. endothermic
3. oxidation
4. reduction

Q. The process of dissolving an acid or a base in water is a/an __________ reaction.

1. Endothermic
2. Exothermic
3. Oxidation
4. Reduction

Q. Dilution of an acid or a base is an endothermic reaction.

1. True
2. False

Q. You are given a 15% solution of sulphuric acid and a 15% solution of $HCN$ (hydrocyanic acid). Which solution has the higher concentration of $H^{+}$ ions?

1. $H_{2}S{O}_4$
2. $HCN$
3. Both have equal concentration
4. Cannot be determined