P1v1=p2v2

[Moka11]

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When it is bottled, the partial pressure of CO2 over a 1 L bottle of soda is 4.0 atm. The concentration of dissolved CO2 is 0.12M. The soda is opened at left at 1.0 atm. What will be the new concentration of dissolved CO2 ?

Why isn't this (4.0atm)(0.12M)=(1.0atm)X?

 

[lowkeydr]

You are mixing up equations here right now its M1V1=M2V2 and P1V1 = P2V2
Instead of relying on equations, think of it conceptually here this is a very easy problem:
you know that adding more moles of CO2 will increase the partial pressure of CO2 in the solution.. so these are related. if .12M of CO2 is causing 4.0 atm of partial pressure inside the soda, then .03M of CO2 will cause 1 atm of partial pressure each. Now the question asks what will happen if soda goes to a pressure of 1atm... well it's easy 1 atm is contributed by .03M of CO2, so .03M is the new concetration