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

• Activity 2.1
• Activity 2.2
• Activity 2.3
• Activity 2.4
• Activity 2.5
• Activity 2.6
• Activity 2.7
• Activity 2.8
• Activity 2.9
• Activity 2.10
• Activity 2.11
• Activity 2.12
• Activity 2.13
• Activity 2.14
• Activity 2.15

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