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9. (a) What is meant by hardness in water? The following names/terms all relate to hardness in water - Leaving Cert Chemistry - Question 9 - 2009
Question 9
9. (a) What is meant by hardness in water? The following names/terms all relate to hardness in water. calcium sulfate temporary permanent ion exchange calcium hydr... show full transcript
Worked Solution & Example Answer:9. (a) What is meant by hardness in water? The following names/terms all relate to hardness in water - Leaving Cert Chemistry - Question 9 - 2009
Step 1
What is meant by hardness in water?
Answer
Hardness in water refers to the presence of dissolved calcium or magnesium salts which make it difficult to form lather with soaps. It can be categorized into two types: temporary hardness, which can be removed by boiling, and permanent hardness, which cannot be removed by boiling.
Step 2
Step 3
Step 4
Step 5
Find the concentration of suspended solids in parts per million (ppm).
Answer
To find the concentration in ppm, the formula used is:
ext{ppm} = rac{ ext{mass of solute (g)}}{ ext{volume of solution (L)}} imes 10^6
Here,
- Mass of suspended solids = 0.02 g
- Volume of solution = 200 cm³ = 0.2 L
Thus,
ext{ppm} = rac{0.02 ext{ g}}{0.2 ext{ L}} imes 10^6 = 100000 ext{ ppm}
Step 6
Outline how the mass of suspended solids was obtained in the experiment.
Answer
- Weigh filter paper before use.
- Filter the sample through the prepared filter paper.
- Wash the filter paper with distilled water to remove any residual solids.
- Dry the filter paper thoroughly to ensure accuracy.
- Reweigh the filter paper to determine the mass of the suspended solids collected.