Using Volume of Solution for Calorimetry Calculations

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Yoon Lee 2A
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Using Volume of Solution for Calorimetry Calculations

Postby Yoon Lee 2A » Mon Jan 11, 2016 7:30 pm

Hello!

Today in lecture, we went over the example with 50.0 mL of 1.0 M HCL and NaOH. We used the volume and density to find mass, but I was wondering why we cannot find the moles of water produced and then convert the moles to grams and then use
q = g x Csp x change in temperature? Why do we need to use the volume?

Thank you!

704578485
Posts: 62
Joined: Fri Sep 25, 2015 3:00 am

Re: Using Volume of Solution for Calorimetry Calculations

Postby 704578485 » Mon Jan 11, 2016 8:36 pm

The method you are referencing would be completely fine in solving the specific example. However, first you would have to calculate the number of moles of water using the formula M=n/v and then using its molar mass calculate the amount of water in grams. Since we are given the volume of water already indirectly with the information that we use 50ml of each substance we can simply use the density of water(1g/ml) to convert the amount of water to a weight in grams. Your process will result in the same answer it is just the way Professor Lavelle is simpler and faster.


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