Question

Precipitate formation during chemical reaction is indicated by this arrow :
a.) $ \uparrow $
b.) $ \to $
c.) $ \downarrow $
d.) $ \leftarrow $

Answer 1

Hint: The precipitates are insoluble solid products formed in a reaction when some cations and anions combine in a chemical reaction in the solution. In some reactions, the precipitates are formed immediately while some others take time. The arrow usually points in the direction where the product moves. For ex- the upward arrow points to the gases product which escapes.

Complete step by step answer:
Firstly we will know what a precipitate is.
A precipitate may be defined as the formation of a solid product from the combination of two solutions. The chemical reactions and equations use the arrows to represent some specialities, thereby avoiding words and sentences.
The arrow pointing upward indicates that the product formed is a gas that will escape out of the solution. So, the option a.) can not be the answer.
The arrows in the right direction indicate that the reactants are on the left side while the product formed are on the right side. Actually, the direction of the arrow, right or left has the products on the head side and reactants on the tail part.
So, the options b.) and d.) will also not be the correct answers.
The arrow pointing downward indicates that the product will spontaneously precipitate from the solution. This means that as the product is formed, it will immediately precipitate out.
So, the correct answer is “Option C”.

Note: It must be noted that the precipitation arrow should be written only on the side of the product which forms precipitation. For ex- In the reaction as-
$Ca{(HC{O_3})_2} + Ca{(OH)_2} \to 2CaC{O_3} \downarrow + 2{H_2}O$

The product calcium carbonate forms precipitate not water. So, the arrow will only be on the side of calcium carbonate and not on water.