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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: rudiment274 on October 09, 2014, 07:06:42 PM

Title: Molarity question?
Post by: rudiment274 on October 09, 2014, 07:06:42 PM

If 0.900 g sodium carbonate is added to 325 mL of 0.150 M HCl, calclate the molarity of H+ in the solution AFTER the reaction goes to completion?

Reaction: Na2CO3(s)+2HCl(aq)--->2 NaCl(aq)+H2O(l)+CO2(g)

I tried finding moles of Na2CO3 from 0.900 g Na2CO3 then I found moles Na2CO3 from the molarity of 325 mL. Do I subtract the two? And how would I find the molarity of H+?

Title: Re: Molarity question?
Post by: Hunter2 on October 10, 2014, 01:00:54 AM

You have aratio 1 Carbonate to 2 Hydrochloric.

Calculate the moles of  Carbonate then you know how much moles you need of Hydrochloric. The difference of this to the given HCl is the result.