15.00 mL of a NaCl solution that has a mass of 15.78 grams is placed in an evaporating dish and heated to concentrations for the dryness. The remaining solid has a mass of 3.26 grams. Calculate the following solution: % by mass, % mass/volume, and molarity.

15.00 mL of a NaCl solution that has a mass of 15.78 grams is placed in an evaporating dish and heated to concentrations for the dryness. The remaining solid has a mass of 3.26 grams. Calculate the following solution: % by mass, % mass/volume, and molarity.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 98AP

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Question

I do not understand this pre lab question

the concentration of a solution, simply because molarity is defined in terms of moles and moles are directly
related to the stoichiometry of reactions. Moles are defined as the grams of solute divided by its molar
mass.
In this experiment a solution of sodium chloride of unknown concentration will be used. You will
measure the mass of a known quantity of NaCl solution. The sample will be heated to evaporate the water
until it is dry. The mass of the sample after heating represents the mass of NaCl in the mixture. The
concentration of NaCl will be determined by the three methods mentioned above.
PRELABORATORY QUESTIONS
15.00 mL of a NaCl solution that has a mass of 15.78 grams is placed in an evaporating dish and heated to
dryness. The remaining solid has a mass of 3.26 grams. Calculate the following concentrations for the
solution: % by mass, % mass/volume, and molarity.
EXPERIMENTAL PROCEDURE
PART A: WATER CONTENT IN FOOD
1. Label three watch glasses as 1-3. Measure their masses to the nearest 0.01 grams and record the
values in the notebook.
2. Cut several thin slices of a fruit or vegetable and arrange it on the watch glass label 1
as far apart as possible. Record the type of foods used.
3. Now weigh the watch glass with the food. Record in your notebook.
Repeat the procedure (steps 2 and 3) with other 2 different types of fruit or vegetables. Be careful that
step

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