Question

A student dissolves 11.8 g of sodium hydroxide NaOHin 300. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 21.0 °C to 30.9 °C over the course of 3.9 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction:
NaOH(s)→ Na+(aq)+ OH−(aq)

You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: It's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the knows and published values for this reaction.

Is this reaction exothermic, endothermic, or neither?

Answer 1

Answer:

The reaction is exothermic

Explanation:

For the dissolution reaction of the problem:

NaOH(s) → Na⁺(aq) + OH⁻(aq)

the temperature of the reaction rise from 21.0°C to 30.9°C. As the temperature increases, the reaction is EXOTHERMIC because produce heat when occurs increasing the temperature of the solution.