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analysis and purification of water samples (a) - Coggle Diagram
analysis and purification of water samples (a)
Objective
To determine the amount of dissolved solid in samples of water
Hypothesis
Analysis of the pH and dissolved solids of water samples can help determine the regions the water comes from
Materials
Water samples A, B, C and D
Universal indicator paper
Mass balance
Evaporating basin
25 cm3 graduated cylinder
Bunsen burner, tripod & gauze
Practical tip
Don’t overheat during step 4 as you run the risk of thermally decomposing some of the solids, leading to erroneous results
Method
Use the universal indicator paper to determine the pH of the water sample
Accurately weigh an empty evaporating basin to two decimal places
Add 25 cm3 of water sample A into the evaporating basin
Heat the evaporating basin on a tripod and gauze using a Bunsen burner until the solids start to form and the majority of water has evaporated
Leave for the remaining water to evaporate off
Weigh the cooled evaporating basin again and calculate the mass of the solids that were dissolved in the water.
Evaluation
The results could be compared to the national water safety levels and by analysis the regions of each sample could be deducted e.g. region of high acid rain, water from a salt water supply etc.
Conclusion
The amount of dissolved solids in water can be determined and is a useful indicator of water quality