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Predict for the third reaction

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Reference no: EM132560569

In experiment, 1.00 grams of NaOH was mixed with 50.0 mL of distilled H2O. If the initial temperature of the H2O was 25.00°C and the final temperature of the solution 30.30°C, determine ΔH° for the first reaction.

- In experiment, 1.00 grams of sodium hydroxide was mixed with 50.0 mL of 0.5M HCL. If the initial temperature of the 0.5M HCL was 25.00°C and the final temperature of the solution 36.97°C, determine ΔH° for the second reaction.

- In experiment, 25.0ml of 1.00M HCL was mixed with the 50.0mL of 1.00M NaOH. If the initial temperature of the HCL was 25.00°C. and the final temperature of the solution was 31.67°C, determine ΔH° for the third reaction.

1) The heat evolved or absorbed by the surroundings (the solution). Don't forget to include the mass of any solid you add as part of the mass of your surroundings.

ΔH° for each of the three reactions:

NaOH(s) NaOH(aq)

NaOH(s) + HCl(aq) NaCl(aq) + H2O(l)

NaOH(aq) + HCl(aq) NaCl(aq) + H2O(l)

Two of the reactions above add, without modification/reversal, to give the remaining reaction.

a) Which two?

b) What ΔH° do they predict for the third reaction?

c) Is the value predicted by summation within five percent of the value that was determined directly?

2. If you were to repeat this experiment in person, what sources of error would you expect?

Reference no: EM132560569

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