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:


Will the amount of $\ce{CO2}$ that reacts with water depend upon the salt concentration?
Will the amount of titrant used to figure out the amount of $\ce{CO2}$ dissolved also change depending on the salt concentrations?
100 mL of water and added 5 g of $\ce{CO2}$ and measured the time it took to dissolve completely


This statement doesn't make sense.  Firstly, if you know it dissolved completely, why try to determine how much dissolved?  Secondly, the only way that much CO2 would dissolve is if you did the experiment at high pressure.  

If you want literature data to compare your experiment to, see Fig. 6c or equation 6 of Behaviour of the CO2-H2O system