Question

PART B. HEAT OF SOLUTION REACTION Obtain a sample bottle with an unknown ionic salt. Record its identification letter. Gently dry the inside of the calorimeter and weigh it. If the calorimeter is not dry, you will not be able to accurately find the mass of water in your calorimeter. Add about 50 mL of distilled water and weigh again. Measure the water's initial temperature. Use a plastic weighing "boat" set to zero on the balance and use it to measure out about 5 grams of sample form the bottle. Record the mass to the nearest milligram. Add the sample to the water in the calorimeter and stir with the thermometer. When all the solid has dissolved (or as much as will dissolve) the water temperature should have reached a maximum or minimum. Record this final water temperature. Rinse the solution out in the sink and return the sample bottle and calorimeter to the cart. Put away all other hardware.

Answer 1

1. Calorimeter should be dried before adding water water to it because doing we will able to measure the accurate mass of water in calorimeter.

2. Because Graduated cylinder are labeled to measure the volume in good approximation. To have exact volume , volumetric flasks are used,they are highly accurate.