# Rainwater is acidic because CO2 (g) dissolves in the water

Question 1

Question 1: Rainwater is acidic because CO2 (g) dissolves in the water,
creating carbonic acid, H2CO3. If the rainwater is too acidic,
it will react with limestone and seashells (which are principally made of calcium carbonate, CaCO3), forming calcium bicarbonate, Ca(HCO3)2

1. Write the equilibrium expression of the forward and reversed reactions for each of the reversible reactions above.
2. Calculate the concentrations of hydrogen ion, bicarbonate ion (HCO3)
and calcium ion in a raindrop that has a pH of 5.60, assuming that the sum of all three species in the raindrop is 1.0 ×10-5 M?
3. What is the equilibrium constant of the second reversible reaction?
4. What will happen to each of the reactions if the environment’s temperature increases?

Question 2

Question 3

Rainwater is acidic because CO2(g) dissolves in the water, creating carbonic acid, H2CO3. If the rainwater is too acidic, it will react with limestone and seashells (which are principally made of calcium carbonate, CaCO3). Calculate the concentrations of carbonic acid, bicarbonate ion (HCO3-) and carbonate ion (CO32-) that are in a raindrop that has a pH of 5.60, assuming that the sum of all three species in the raindrop is 1.0 * 10-5 M.

Step 1

Given: Raindrop pH = 5.60

Step 2

Now, reaction equation for the given reaction is as follows.

Step 3

Step 4

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