Thursday, April 29, 2021

Acids, Bases and Salts | Class 10 | Activity 2.1 with Solution

Activity 2.1 
  • Collect the following solutions from the science laboratory– hydrochloric acid (HCl), sulphuric acid (H2SO4), nitric acid (HNO3), acetic acid (CH3COOH), sodium hydroxide (NaOH), calcium hydroxide [Ca(OH)2], potassium hydroxide (KOH), magnesium hydroxide [Mg(OH)2], and ammonium hydroxide (NH4OH).
  • Put a drop of each of the above solutions on a watch-glass one by one and test with a drop of the indicators shown in Table 2.1.
  • What change in colour did you observe with red litmus, blue litmus, phenolphthalein and methyl orange solutions for each of the solutions taken?
  • Tabulate your observations in Table 2.1
Table 2.1

Sample solution

Red litmus solution

Blue litmus solution

Phenolphthalein solution

Methyl orange solution

 

 

 

 

 


✅ Answer

Sample solution

Red litmus solution

Blue litmus solution

Phenolphthalein solution

Methyl orange solution

HCl

No change

Red

Colourless

Pinkish red

H2SO4

No change

Red

Colourless

Pinkish red

HNO3

No change

Red

Colourless

Pinkish red

CH3COOH

No change

Red

Colourless

Pinkish red

NaOH

Blue

No change

Red to pink

Remains yellow

KOH

Blue

No change

Red to pink

Remains yellow

Mg(OH)2

Blue

No change

Red to pink

Remains yellow

NH4OH

Blue

No change

Red to pink

Remains yellow

Ca(OH)2

Blue

No change

Red to pink

Remains yellow



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