When mixing HCl(aq) and NaOH(aq) of the same concentration (1.0 m) to produce 100 mL of product solution what volume ratio produces the largest temperature change

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Explanation:

We have to understand the reason of temperature change , when NaOH reacts with HCl neutralization reaction occurs producing energy. When this released energy is absorbed temperature is increased.

So when 1 mole off NaOH reacts with 1 mole of HCl reacts 57.3 KJ of energy is released .

During a reaction for , when equivalent number of moles reacts higher energy will be produced.

If 80 ml HCl and 20 ml NaOH reacts , then only 20 ml NaOH reacts with 20 ml of HCl and rest 60 ml is not reacting.

But when 60 ml HCl and 40 ml NaOH reacts 40 ml of each are reacting, so energy produced will be higher.

so B > A

For II the observed phenomena is already discussed as higher number of moles of HCl and NaOH reacts so , due to which higher energy is released and thus temperature is higher.

50 ml of each HCl and NaOH produces largest temperature change , as higher number of moles of HCl and NaOH reacts so , due to which higher energy is released and thus temperature is higher.

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