A student is given a sample of a pink manganese
a. What was the mass of the hydrate sample?
b. What is the mass of the anhydrous
c. How much water was driven off?
d. What is the percent by mass of water in the hydrate?
e. How many grams of water would there be in
f. How many grams of
g. How many moles of water are present per mole
h. What is the formula of the hydrate?
(a)
Interpretation:
The mass of the hydrated sample of pink manganese
Concept introduction:
The water of crystallization is the number of water molecules present in crystals compounds. The water of crystallization is also known as the water of hydration. The water molecules present in the crystal helps the crystal to impart color. These water molecules can be easily removed from the crystal by heating them.
Answer to Problem 1ASA
The mass of the hydrated sample of pink manganese
Explanation of Solution
The sum of the masses of crucible, cover, and sample of a pink manganese
The sum of the masses of crucible and cover
The mass of hydrate can be calculated by the difference between these two mass.
The mass of hydrate is given by the formula as shown below.
Substitute the value of
Therefore, the mass of the hydrate is
The mass of the hydrated sample of pink manganese
(b)
Interpretation:
The mass of the anhydrous
Concept introduction:
The water of crystallization is the number of water molecules present in crystals compounds. The water of crystallization is also known as the water of hydration. The water molecules present in the crystal helps the crystal to impart color. These water molecules can be easily removed from the crystal by heating them.
Answer to Problem 1ASA
The mass of the anhydrous
Explanation of Solution
The sum of the masses of crucible, cover, and sample of an anhydrous manganese
The sum of the masses of crucible and cover
The anhydrous
The mass of the anhydrous
Substitute the value of
Therefore, the mass of the anhydrous
The mass of the anhydrous
(c)
Interpretation:
The mass of water released from the hydrated sample of
Concept introduction:
The water of crystallization is the number of water molecules present in crystals compounds. The water of crystallization is also known as the water of hydration. The water molecules present in the crystal helps the crystal to impart color. These water molecules can be easily removed from the crystal by heating them.
Answer to Problem 1ASA
The mass of water released from the hydrated sample of
Explanation of Solution
The mass of the anhydrous
The mass of the hydrated sample of pink manganese
The mass of water released on heating can be given by the formula as shown below.
Substitute the mass of hydrate and mass of anhydrate in the above equation.
Therefore, the mass of water released from the hydrated sample is
The mass of water released from the hydrated sample is calculated as
(d)
Interpretation:
The percent by mass of water in the hydrate of
Concept introduction:
The water of crystallization is the number of water molecules present in crystals compounds. The water of crystallization is also known as water of hydration. The water molecules present in the crystal helps the crystal to impart color. These water molecules can be easily removed from the crystal by heating them.
Answer to Problem 1ASA
The percent by mass of water in the hydrate of
Explanation of Solution
The mass of water released from the hydrated sample is
The mass of the hydrated sample of pink manganese
The percent by mass of water in the hydrate is given by the expression as shown below.
Substitute the values of the mass of water and mass of hydrate in the sample in the above equation.
Therefore, the percent by mass of water in the hydrate is
The percent by mass of water in the hydrate is calculated as
(e)
Interpretation:
The mass of water and the number of moles of water in
Concept introduction:
The water of crystallization is the number of water molecules present in crystals compounds. The water of crystallization is also known as the water of hydration. The water molecules present in the crystal helps the crystal to impart color. These water molecules can be easily removed from the crystal by heating them.
Answer to Problem 1ASA
The mass of water and the number of moles of water in
Explanation of Solution
The percent by mass of water in the hydrate is
The molar mass of
The number of moles of a substance is given by the expression as shown below.
Where,
•
•
Substitute the values of mass and molar mass of water in the above equation.
Therefore, the number of moles of water in
The mass of water and the number of moles of water in
(f)
Interpretation:
The mass of water and the number of moles of
Concept introduction:
The water of crystallization is the number of water molecules present in crystals compounds. The water of crystallization is also known as the water of hydration. The water molecules present in the crystal helps the crystal to impart color. These water molecules can be easily removed from the crystal by heating them.
Answer to Problem 1ASA
The percent by mass of water in the
Explanation of Solution
The mass of the anhydrous
The mass of the hydrated sample of pink manganese
The percent by mass of
Substitute the values of the mass of
The percent by mass of water in the
The molar mass of
The number of moles of a substance is given by the expression as shown below.
Where,
•
•
Substitute the values of the mass and molar mass of
Therefore, the number of moles of
The percent by mass of water in the
(g)
Interpretation:
The number of moles of water present per mole
Concept introduction:
The water of crystallization is the number of water molecules present in crystals compounds. The water of crystallization is also known as the water of hydration. The water molecules present in the crystal helps the crystal to impart color. These water molecules can be easily removed from the crystal by heating them.
Answer to Problem 1ASA
The number of moles of water present per mole
Explanation of Solution
The number of moles of
The number of moles of water in
The number of moles of water present per mole
Substitute the value of the number of moles of water and the number of moles of
Therefore, the number of moles of water present per mole
The number of moles of water present per mole
(h)
Interpretation:
The formula of hydrate of
Concept introduction:
The water of crystallization is the number of water molecules present in crystals compounds. The water of crystallization is also known as the water of hydration. The water molecules present in the crystal helps the crystal to impart color. These water molecules can be easily removed from the crystal by heating them.
Answer to Problem 1ASA
The formula of hydrate is
Explanation of Solution
The given sample is a pink manganese
The number of moles of water present per mole
Therefore, the formula of hydrate is
The formula of hydrate is
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Chapter 6 Solutions
Chemical Principles in the Laboratory
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