Question

A student has mixed the solutions of lead(ii) nitrate and potassium iodide . What was the colour of the precipitation formed? Can you name the compound? Precipitated?(ii) Write the balanced chemical reaction for this reaction.(iii) what type of reaction is it?

Answer 1

Hint: At first we will write what is given in the question. Then we will write the chemical formula of lead nitrate and potassium iodide. Then we will write the reaction and then we will see what the products are formed. We will write the colour of precipitate and the compound names. In the end we will write what type of reaction it is.

Complete step-by-step answer:Step1. We have given two compounds lead nitrate and potassium iodide. These both compounds are mixed and a reaction happens. We need to know products, the reaction type and colour of precipitation.
Step2. Formula of lead nitrate is $PbN{O_3}$ and the formula of potassium iodide is KI. NO when these two compounds react they will break into the ions and then will exchange their ions. Both compounds will exchange their ions with each other so it will be a double displacement reaction But when the reaction happens a precipitation is formed so it will also be the precipitation reaction. Hece two types of reactions happening. Precipitation and double displacement reaction.
Step 3. The reaction happening is given below:
$PbN{O_3} + KI \to Pb{I_2} + KN{O_3}$
Here the Lead Iodide is the precipitation. It is yellow in color.
(i) Color of precipitation is yellow.
(ii) It is Lead Iodide.
(iii) Reaction is $PbN{O_3} + KI \to Pb{I_2} + KN{O_3}$
(iv) Double displacement and precipitation reaction.

Note:Potassium iodide is a chemical compound which is also used as medication and dietary supplement. It used to treat hyperthyroidism, to protect thyroid gland. It is also used to protect the skin from radiation.