Question

Почему мыло в жесткой воде не мылится?напишите уравнение реакции, отражающей взаимодействие натриевого мыла с жесткой водой, содержащей сульфат кальция

Answer 1

$2C_1_7H_3_5COONa+CaSO_4=>(C_1_7H_3_3COO)_2Ca+Na_2SO_4$

Answer 2

Why does soap not lather in hard water? What is the reaction equation for the interaction between sodium soap and hard water containing calcium sulfate?

Soap does not lather well in hard water due to the presence of calcium and magnesium ions. Hard water contains dissolved minerals, such as calcium and magnesium salts, which can react with the soap molecules and form insoluble compounds. These compounds, known as soap scum, reduce the effectiveness of the soap and prevent it from producing a good lather.

The reaction equation for the interaction between sodium soap and hard water containing calcium sulfate can be represented as follows:

2RCOO^-Na^+ (sodium soap) + Ca^2+ (calcium ion) → (RCOO^-)2Ca (insoluble calcium soap) + 2Na^+ (sodium ion)

In this reaction, the calcium ions from the hard water combine with the soap molecules to form insoluble calcium soaps. These calcium soaps are not soluble in water and appear as a white precipitate or scum. As a result, the soap is unable to dissolve properly in the water and does not produce a good lather.

It's important to note that the reaction equation provided is a simplified representation of the interaction between sodium soap and hard water. The actual reaction may involve other ions present in the water and can vary depending on the specific soap formulation and the composition of the hard water.

Please let me know if you have any further questions!