how do i start this problem ? What formulas will I need

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The enthalpy of neutralization for the reaction of a strong acid with a strong base is

−56
kJ/mol of water produced. How much energy will be released when 197.6 mL of 0.420 M HNO3 is mixed with 152.0 mL of0.467 M KOH?
Oct 10th, 2015

When acid and base reacts they neutralize to form water (H2O) and release energy.

To solve this problem, you need to know this fact and do as follows -

1. Find the total number of moles of acid (HNO3) and base (KOH) by multiplying concentration with volume

so, number of moles of HNO3 = 197.6 * 0.420 moles

2. Do the same for base.

3. Which ever (acid or base) has less number of moles, consider that. Number of moles of H2O formed will be the same (as the one which has less number of moles)

4. Multiply this number of moles of water with enthalpy. This will give you the total energy released.

Please let me know if you need any clarification. I'm always happy to answer your questions. Kindly best this answer if it has helped you.
Oct 10th, 2015

Thanks so much, you just forgot to mention the conversion of mL to L so that the units crossed out for the M (mol/L). Very helpful :)

Oct 10th, 2015

You are welcome

Oct 10th, 2015

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Oct 10th, 2015
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Oct 10th, 2015
Sep 24th, 2017
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