Calculating the Formulas of Hydrated Salts

Calculating the Formulas of Hydrated Salts

Assessment

Interactive Video

Chemistry, Science

11th Grade - University

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

Professor Dave explains how to calculate the formula of a hydrated salt. He introduces the concept of salts and hydrates, and describes an experiment to determine the number of water molecules in a hydrate. By heating the hydrate, the water is vaporized, allowing the mass of the anhydrous salt to be measured. The mass of water is calculated by difference, and both masses are converted to moles. The ratio of moles of salt to water is determined, allowing the complete formula of the hydrated salt to be written. This process demonstrates how simple calculations can reveal molecular structures.

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5 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the term used for any compound consisting of formally charged ions?

Element

Covalent Compound

Salt

Molecule

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in determining the number of water molecules in a hydrated salt?

Adding more water to the salt

Cooling the salt

Heating the salt to remove water

Dissolving the salt in water

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

After heating, what is the mass of the anhydrous magnesium carbonate obtained?

15.67 grams

8.09 grams

7.58 grams

0.09 grams

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many moles of water are found in the magnesium carbonate hydrate after calculations?

1.00 moles

0.45 moles

5.00 moles

0.09 moles

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the ratio of water molecules to magnesium carbonate in the hydrate?

1:2

1:1

1:3

1:5

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