# Does CO2 dissolution in different salt concentrations affects the amount of carbonic acid formed?

We have a school experiment, where I must report on the following question:

Does salinity affect the solubility of $\ce{CO2}$ in saltwater?

So we selected four different concentrations of salt (in the range of 1-4 %) in 100 mL of water and added 5 g of $\ce{CO2}$ and measured the time it took to dissolve completely. We then used titration to figure out the amount of $\ce{CO2}$ (reacting with water to give weak carbonic acid) that is dissolved.

My questions are:

1. Will the amount of $\ce{CO2}$ that reacts with water depend upon the salt concentration?

2. Will the amount of titrant used to figure out the amount of $\ce{CO2}$ dissolved also change depending on the salt concentrations?

• If you expect an answer, you should give your guesses (ooops, hypothesis) to the questions. – LDC3 Aug 31 '14 at 14:23
• It seems like you did the experiment. Why even ask the question? Just analyse the data you got. – tschoppi Aug 31 '14 at 23:02

100 mL of water and added 5 g of $\ce{CO2}$ and measured the time it took to dissolve completely