[xangelofxdeathx]

Which combination of solutions of HCl and NaOH would produce the largest change in temperature? (delta T)

A) 50 mL of 1 M HCl with 50 mL of 1 M NaOH
B) 50 mL of 2 M HCl with 50 mL of 2 M NaOH
C) 100 mL of 1 M HCl with 50 mL of 2 M NaOH
D) 100 mL of 1 M HCl with 100 mL of 1 M NaOH

I tried but I can't seem to figure out what I am supposed to do in this problem. Can someone give me a hint/solution? (The answer is B)

[xiankai]

if there is a larger reaction, there would be more heat generated, would it not?

[enahs]

if there is a larger reaction, there would be more heat generated, would it not?

Not completely.

B and D react the same quantity of moles of substance (which, xangelofxdeathx, that is what he means, and how you do it).

However, in D there is more solvent than B, thus more water, and less change in temperature.

[exec]

This is how I would try this....

A change of temperature is due to heat. Here, the heat is the enthalphy change of neutralisation, defined as heat released when H+ reacts with OH- to form H2O.

Using   delta(H) = mc x delta(T), assuming that resultant solution has heat capacity of c,

Comparing B and D which result in equal amount of heat(same mole of H2O result), delta(H) and c is the same for both but m is not. m(D) > m(B) but delta(H) is the same => delta(T) for B is higher.

Just my 2 cents.