Solution of Chapter 1. pH of acids and bases (Science Lab Manual Book)

AIM:

To find the pH of the following samples by using pH paper/universal indicator:

(a) Dilute hydrochloric acid (HCl)

(b) Dilute sodium hydroxide (NaOH) solution

(c) Dilute ethanoic acid (CH₃COOH) solution

(d) Lemon juice

(e) Water

(f) Dilute hydrogen carbonate (NaHCO₃) solution

What is pH?

What are the different characteristics of the solution (by pH), explain them and give two examples each?

Give two examples of natural and synthetic Indicator:

Using any for indicator differentiate acid, base and neutral solution?

What is a Universal indicator, Give one example?

What is the pH of rainwater?

What is the pH of soap solution?

What is the pH of the stomach?

What is Hyperacidity. Give any two examples of an antacid?

What according to you should be the pH of dil. HCl and dil. NaOH solution? Observe and explain your findings.

Why NH₄OH is a weak base?

On opening the soda water bottle the dissolved CO₂ comes out. Would the ph of the solution increase or decrease as the gas comes out? Explain your answer?

What happens to the ph of the solution when we increase the temperature of the solution? Explain?

Dry litmus paper does not show any color change when brought to dry HCl gas. Why?

If a wet blue litmus paper is brought closer to dry HCl gas, what changes will you observe and Why?

Why does lime water turn milky when CO₂ gas is passed through it?

Why do we use Zinc granules for the test in the lab?

Why do metal displace hydrogen from dilute acids?

Do all metals displace hydrogen gas from dilute acids?

What would happen when dil. HCl and dil. NaOH are mixed in equal amounts? Write the equation also?

Why hydrogen gasan explosion?

Write the reaction of zinc with dil — sulphuric acid.

What is the difference between a strong acid and a weak base?

What will happen to a lighted candle if it is brought near the mouth of a gas jar containing hydrogen gas?

What will be the color of blue litmus paper on bringing it in contact with a drop of dil. NaOH?

AIM:

Studying the properties of acids (HCl) by their reaction with

(i) Litmus solution (Blue/Red)

(ii) Zinc metal (Zn)

(iii) Solid sodium carbonate (Na₂CO₃)

AIM :

Studying the properties of bases (NaOH) by their reaction with

(i) Litmus solution (Blue/Red)

(ii) Zinc metal (Zn)

(iii) Solid sodium carbonate (Na₂CO₃)