30. Which among the solutions given below will not show a change in pH on dilution? (I). 0.1MNH4COOCH3, (II). 0.1 M NaCl, (III). 0.1 M NH4OH, (IV). 0.01 M H2SO4.
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Final Answer : 1) 0.1 M NH4COOCH3 √
2) 0.1 M NaCl √
Steps and Understanding :
1) NH4COOCH3 (Ammonium Acetate) is a buffer made up of weak acid CH3COOH and its conjugate base NH4OH (Ammonium Hydroxide) .
We know that,
=> pH of any buffer solution does not change upon reasonable dilution as it depends on ratio of concentration of weak acid and its conjugate base.
2) NaCl (Sodium Chloride) is a salt made by reaction of strong acid HCl and strong base NaOH.
On dilution, there is no change in pH as there is no change concentration of Na+ and Cl-which are spectator ions here
3)0.1M NH4OH is a weak base / electrolyte and on dilution with water, it's pH decreases or it's basicity decreases.
4) 0.01M Sulphuric acid
On dilution with water, pH of sulphuric acid increases.
2) 0.1 M NaCl √
Steps and Understanding :
1) NH4COOCH3 (Ammonium Acetate) is a buffer made up of weak acid CH3COOH and its conjugate base NH4OH (Ammonium Hydroxide) .
We know that,
=> pH of any buffer solution does not change upon reasonable dilution as it depends on ratio of concentration of weak acid and its conjugate base.
2) NaCl (Sodium Chloride) is a salt made by reaction of strong acid HCl and strong base NaOH.
On dilution, there is no change in pH as there is no change concentration of Na+ and Cl-which are spectator ions here
3)0.1M NH4OH is a weak base / electrolyte and on dilution with water, it's pH decreases or it's basicity decreases.
4) 0.01M Sulphuric acid
On dilution with water, pH of sulphuric acid increases.
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