As the distilled water was added to the solid sodium hydroxide, the solid began to dissolve. The temperature of the solution being formed in the test tube increased. A sample of the solution changed a red piece of litmus paper blue. Explain why the temperature increased (1) and why the litmus paper changed from red to blue (2).
Substance ΔH°f (kJ/mol)
NaOH (s) -425.8
Na+ (aq) -240.34
OH- (aq) -230.02
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