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Chapter 9: Problem 6

State whether the following statements are true or false. Setting of mortar is the result of reaction between slaked lime and \(\mathrm{CO}_{2}\) of air.

Short Answer

Expert verified
Answer: True.

Step by step solution

01

Understanding the Setting of Mortar

The process of setting of mortar involves the hardening of a mixture of cementitious materials, such as cement or lime, with sand and water to form a binding material used in construction. In this specific statement, we are concerned with the role of slaked lime in the process.
02

Identifying Slaked Lime

Slaked lime, also known as calcium hydroxide or \(\mathrm{Ca(OH)}_{2}\), is a white powder produced by mixing quicklime (\(\mathrm{CaO}\)) with water. This slaked lime can be used as the cementitious material in mortar.
03

Carbonation Process

The carbonation process is a chemical reaction in which carbon dioxide gas from the air reacts with the calcium hydroxide present in the mortar mixture. The carbonation process can be represented by the following chemical equation: \(\mathrm{Ca(OH)}_2 + \mathrm{CO}_{2} \rightarrow \mathrm{CaCO}_{3} + \mathrm{H}_{2}\mathrm{O}\) In this reaction, the carbon dioxide from the air reacts with slaked lime (\(\mathrm{Ca(OH)}_{2}\)) in the mortar to form calcium carbonate (\(\mathrm{CaCO}_{3}\)) and water (\(\mathrm{H}_{2}\mathrm{O}\)). Calcium carbonate is a solid compound that contributes to the hardening of the mortar.
04

Evaluating the Statement

Based on the information we have gathered, the statement "Setting of mortar is the result of reaction between slaked lime and \(\mathrm{CO}_{2}\) of air" is true. The hardening of mortar composed of slaked lime is due to the carbonation process, which involves the reaction between slaked lime and carbon dioxide present in the air to form calcium carbonate.

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Most popular questions from this chapter

The steps for the manufacture of nitric acid by Ostwald process are given. Arrange them in sequence. (a) recirculation of nitric oxide (b) addition of \(\mathrm{H}_{2} \mathrm{O}\) to nitrogen dioxide (c) oxidation of nitric oxide (d) catalytic oxidation of ammonia (a) 4321 (b) 4312 (c) 3421 (d) 3412

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