Question

Please help! Thanks :D1. Write a balanced chemical equation for each double replacement reaction that occurs.Note: Compounds with Na+, K+, and/or NO3− are soluble.2. Why was there no reaction in some of the wells? (See Introduction.)

Answer 1

Step-by-step explanation:

Here, we want to write the balanced precipitation reactions:

1) Calcium Nitrate and Potassium Iodide

There is no reaction between these two. Hence, we do not write a chemical equation for it. This can be seen directly from the table as indicated by NR, which means no reaction.

2) Calcium Nitrate and Potassium Hydroxide

We have the equation of the reaction as follows:

`\text{ Ca\lparen NO}_3)\placeholder{⬚}_(2(aq))\text{ + KOH}_((aq))\text{ }\rightarrow\text{ Ca\lparen OH\rparen}_(2(s))\text{ + KNO}_(3(aq))`
`\text{ Ca\lparen NO}_3)\placeholder{⬚}_(2(aq))\text{ + 2KOH}_((aq))\text{ }\rightarrow\text{ Ca\lparen OH\rparen}_(2(s))\text{ + 2KNO}_(3(aq))`

The precipitate formed here is calcium hydroxide, which is the faint white precipitate

3) Calcium Nitrate and Sodium oxalate

`Ca(NO_3)\placeholder{⬚}_(2(aq))\text{ + Na}_2C_2O_(4(aq))\text{ }\rightarrow\text{ CaC}_2O_(4(s))\text{ + 2NaNO}_(3(aq))`

Calcium oxalate is the precipitate here, which is the white precipitate

4) Calcium Nitrate and Sodium Sulfate:

There is no reaction here. This can be seen indicated by NR