pH

Q.

pH of 1M HCl is ___

Q.

Fresh milk has a pH of $6$. How do you think the pH will change as it turns into curd?

1. pH will reduce

2. pH will increase

3. It becomes same as milk

4. None of the above

Q.

A milkman adds a very small amount of baking soda to fresh milk.

1)why does he shift the ph of the fresh milk from 6 to slightly alkaline?

2)why does thisilk take long time to set as curd

Q.

What is hydrochloric acid on the pH scale?

Q. What are the chemical properties of acids and bases ?

Q.

What are five types of salts? Explain with examples.

Q.

The colour of phenolphthalein in acids is:

1. Colourless

2. Blue

3. Pink

4. Red

Q.

What is a pH meter?

Q.

What effect does the concentration of ${\mathrm{H}}^{+}\left(\mathrm{aq}\right)$ ions have on the nature of the solution?

Q.

Explain the pH change as the cause of tooth decay.

Q.

A solution turns red litmus blue. Its pH is likely to be :

(a) 1

(b) 4

(c) 5

(d) 10

Q.

Will the dilution of acid leads to decrease in ph value

Q.

Name the scientist who developed the pH scale?

Q.

Give the ph value of milk of magnesia.

Q.

What is the pH of a neutral solution ?

Q. What do you mean by metallic oxides are basic and non metallic oxides are acidic?

Q. ___ has high pH value. (Dilute HCl or Concentrated HCl)

Q.

pH is decreased, when hydrogen ion concentration increases.

1. False

2. True

Q.

If the concentration of H+(aq) ions decreases the pH will increase.how?

Q.

Which of the following basic solution will have the highest pH?

1. NaOH

2. NaHCO₃

3. NH₄OH

4. Mg(OH)₂

Q.

What precautions should be taken while working in a chemistry lab? Mention any five.

Q.

The pH of a solution is 8. What is the value of pOH of the solution?

Q.

What should be added to

(a) increase the $p^H$ value,

(b) decrease the $p^H$value of a neutral solution

Q.

Account for the following: State the relation between the hydrogen ion concentration of an aqueous solution and its $\mathrm{pH}$ ?

Q.

Identify the effect of dry Hydrogen chloride gas on litmus paper:

Q.

(a) Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2.
(i) Which solution will liberate ammonia from ammonium sulphate on heating?
(ii) Which solution is a strong acid?
(iii) Which solution contains solute molecules as well as ions?

Q.

What will happen to the pH of a solution if some HCl is added to it?

Q.

What conclusions can be drawn from the titration curves of amino acids?

Q.

Here are some results of solutions tested with universal indicator paper :

Sulphuric acid: Red

Metal polish: Dark blue

Washing-up liquid: Yellow

Milk of magnesia: Light blue

Oven cleaner: Purple

Car battery acid: Pink

Arrange the solutions in order of their increasing pH values (starting with the one with the lowest pH).

Q.

Fresh milk has a pH of 6. When it changes into curd (yoghurt), will its pH value increase or decrease? Why?