Question on Midterm

Moderators: Chem_Mod, Chem_Admin

Posts: 102
Joined: Thu Jul 25, 2019 12:17 am

Question on Midterm

Postby SarahCoufal_1k » Mon Mar 09, 2020 8:50 pm

On the midterm one of the questions was:
Which combination of solutions of HCl and NaOH would produce the largest ∆T?
the answer was: 50 mL of 2 M HCl with 50 mL of 2 M NaOH
can someone explain reasoning behind this please?

Haley Dveirin 1E
Posts: 101
Joined: Sat Jul 20, 2019 12:17 am

Re: Question on Midterm

Postby Haley Dveirin 1E » Mon Mar 09, 2020 8:54 pm

i'm not 100% sure why but I think it has to do with that option being the most concentrated.

Andrew Liang 1I
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

Re: Question on Midterm

Postby Andrew Liang 1I » Mon Mar 09, 2020 9:36 pm

I think when the question asks greater deltaT we need to assume that it is looking for the greatest reaction. 50 mL of 2 M HCl with 50 mL of 2 M NaOH is the answer because the volume is the smallest out of all the choices and the concentration for both species are the highest. In other words, they are most readily to react with one another

Harry Zhang 1B
Posts: 101
Joined: Sat Sep 14, 2019 12:16 am

Re: Question on Midterm

Postby Harry Zhang 1B » Mon Mar 09, 2020 9:37 pm

For this question, since specific heat is an extensive property, a smaller volume of water will have a lower specific heat and have a larger increase in temperature. This option is also the most concentrated.

Posts: 47
Joined: Mon Nov 18, 2019 12:18 am

Re: Question on Midterm

Postby WGaines_2E » Mon Mar 09, 2020 10:10 pm

The more concentrated the solutions are the more reactive they will be and give off the most energy

Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: Google [Bot] and 3 guests