Question

Which cleansing agent gets precipitated in hard water?

• A. Cetyl trimethyl ammonium bromide
• B. Sodium dodecyl benzene sulphonate
• C. Sodium lauryl sulphate
• D. Sodium stearate

Answer 1

Answer: (D)

Sodium stearate

Answer 2

$2C_{17} H_{35}COONa+CaCI_{2} \to2 NaCI+$ \underset{\text{insoluble calcium stearate (soap)}}{{\left(C_{17}H_{35}COO\right)_{2} Ca}}