Question 17
metal ions in water can react with soap to form
a)acid-base indicators
b)detergents
c)salts
d)soap

Metal ions in water can react with soap to form salts. ( option C)

Explanation:

Soaps have the general formula (RCO2−)nMn+ (Where R is an alkyl, M is a metal and n is the charge of the cation).

C17H35COO- Na+

The class of soaps is determined by the identity of Mn+. Those can be mettalic or lithium soaps.

Let's consider those metals are calcium or magnesium ions, dissolved, with soap, in the water, we'll find that the sodium ion (Na+)  at the polar end of the soap molecule is replaced by a metal ion such as calcium or magnesium ion. This will result in a salt, ( better said an insoluble fatty acid) salt.

This can be shown with the following reaction:

2 C17H35COO- Na+ + Ca2+  → (C17H35COO)2Ca + 2Na+

This results in Calcium stearate, which is the calciumcarboxylate  (calcium salt) of stearic acid.

Metal ions in water can react with soap to form salts.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation: