Salts of …….causes the hardness of water

Question

Salts of …….causes the hardness of water (A) Na+and K+ (B) Ca2 +and Mg2 + (C) Ca2 +and K+ (D) Ca2 +and Na+

Tardigrade Admin · Accepted Answer

Hardness of water is due to the presence of bicarbonates, chlorides and sulphates of Ca and Mg on it. These Ca2 + and Mg2 + ions react with the anions of fatty acids present in soaps to form curdy white precipitates. As a result, hard water does not produce lather with soap immediately.

Q. Salts of …….causes the hardness of water

$N a^{+} an d K^{+}$

$C a^{2 +} an d M g^{2 +}$

$C a^{2 +} an d K^{+}$

$C a^{2 +} an d N a^{+}$

Q. Salts of …….causes the hardness of water

Na+andK+

Ca2+andMg2+

Ca2+andK+

Ca2+andNa+

Hardness of water is due to the presence of bicarbonates, chlorides and sulphates of Ca and Mg on it. These Ca2+ and Mg2+ ions react with the anions of fatty acids present in soaps to form curdy white precipitates. As a result, hard water does not produce lather with soap immediately.

$N a^{+} an d K^{+}$

$C a^{2 +} an d M g^{2 +}$

$C a^{2 +} an d K^{+}$

$C a^{2 +} an d N a^{+}$