Chemistry, short answers assignments
Purpose: Analysis of Hydrated Compounds
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Chemistry, short answers assignments
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- A) Refer to the glossary of your lab manual and in your own words define the following terms. (2 pts)
- a) anhydrous
- b) molar mass (MM)
- c) hydrate
- d) water of crystallization
B)Percentage of Water in a Hydrate Compound
Please watch the video below following the link and also fill in the missing data in table 1
Table 1 (2 pts)
| https://www.youtube.com/watch?v=1ouHZIdV-zE | Trial 1 | Trial 2 |
| 1. Mass of crucible and cover+ hydrate compound
(before heating) |
136.62 | 136.60 |
| 2. Mass of crucible and cover | 135.42 | 135.42 |
| 3. Mass of hydrateCompound (1 -2) | ||
| 4. Mass of crucible + cover + anhydrous compound
(after heating) |
136.18 | 136.29 |
| 5. Mass of water (before heating) –(after heating) |
Questions from the video (2 pts).
- What was the initial color of the sample compound use in the experiment
before heating? (0.5pt)
- What was the final color of the sample compound used in the experiment after
heating? (0.5pt)
- Why did the instructor wear gloves beforehandling the crucible with her
hands? (0.5pt)
- How many times was the sample heated. (0.5pt)
In table 2, use data from table 1 (above) and the formula below to calculate the percentage of water in the hydrate for both trial 1 and trial 2 and determine the average.
Percent of water in hydrate=
Table 2 (3pts)
| Trial 1 | Trial 2 | |
| Percentage of water in hydrate compound | ||
| Average Percentage of Water | ||
- C) Percentage of water in Unknown Hydrate
For table 3 watch the video following the link below and also fill in the missing data using the provided data.
Table 3 (4pts)
| https://www.youtube.com/watch?v=xMkv2RmHNR8 | Trial 1 | Trial 2 |
| 1. Mass of crucible + cover + Unknown hydrate
(before heating) |
52.1833 | 54.2194 |
| 2. Mass of crucible + Cover | 49.2066 | 52.1945 |
| 3. Mass of Unknown hydrate (1 – 2) | ||
| 4. Mass of Crucible + Cover + Anhydrous Compound
(after heating) |
50.6819 | 53.2013 |
| 5. Mass of water (before heating)–(after heating) (g) |
In table 4, use data from table 3 (above) and the formula below to calculate the percentage of water in the unknown hydrate for both trial 1 and trial 2 and determine the average.
Percent of water in Unknown Hydrate =
Table 4 (3pts)
| Trial 1 | Trial 2 | |
| Percentage of water in Unknown Hydrate (%) | ||
| Average Percentage of Water (%) | ||
- D) Water of crystallization in an Unknown Hydrate (5pts)
Use the data in table 5 and the formula below to determine the water of crystallization (x).
Water of crystallization (x) =
Table 5.
| Molar mass of unhydrous compound (AC) | 90 g/mol |
| Molar mass of water (H2O) (g/mol) | 18.02 g/mol |
| Average Percentage (%) of water (H2O) (from table 4) | |
| Percentage of Anhydrous Compound (AC) (%) | |
| Calculated moles of water (mol H2O) | |
| Calculated moles of Anhydrous Compound (AC) (mol AC) | |
| Calculated water of crystallization (x) | |
| Formula of Hydrate | AC . ___ H2O |
Calculate the percentage of water in the following hydrates (4pts)
- a) calcium nitrate tetrahydrate, Ca (NO3)2.4H2O (1pt)
| Calculated molar mass: of Ca (NO3)2.4H2O (g/mol) | |
| Calculated molar mass of Water molecule (4H2O) (g/mol) | |
| Percent of water molecule in compound (%) |
- b) nickel (II) chloride hexahydrate, NiCl2.6H2O (1pt)
| Calculated molar mass: of NiCl2.6H2O (g/mol) | |
| Calculated molar mass of Water molecule (6H2O) (g/mol) | |
| Percent of water molecule in compound (%) |
- d) An unknown hydrate, AC. XH2O has a mass of 1.632 g and anhydrouscompound, AC has a
mass of 1.008 g. What is the experimental percentage of water in the hydrate? (1pt)
| Mass of hydrate (AC.X H2O) | |
| Mass of AC | |
| Percent of water molecule in compound (%) |
- e) A hydrate of calcium sulfate, CaSO4. XH2O contains 20.9% water, calculate the water of crystallization (x) and write the formula of the hydrate(1pt)
Ans: ___________
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