The Determination of Magnesium by Direct Titration Preparation of Solutions: Buffer solution, pH 10: Diluted 57mL of...

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Chemistry

The Determination of Magnesium by Direct Titration
Preparation of Solutions:
Buffer solution, pH 10: Diluted 57mL of NH₃ and 7gNH₄Cl totaling 100mL solution
Eriochrome Black T: Dissolved 102.4mg in 15mL ethanolamine and5mL of absolute ethanol
EDTA: 3.8008g of purified dihydrate Na₂H₂Y2H₂O, mixed with distilled water to total volume of1L
I received a Magnesium Sulfate unknown, and diluted it to 500mLwith distilled water then transferred 3 50mL aliquots to separateconical flasks and added 2mL of pH10 buffer and 4 drops ofEriochrome Black T to each flask and titrated each with 0,01M EDTAuntil I reached the endpoint. My 1st resulted in 19.23mL of EDTAused, 2nd 19.26mL EDTA and 3rd was 19.25mL EDTA used.
During this, I was not given the weight of the unknown MagnesiumSulfate. I am confused on how to determine the unknown MagnesiumSulfate, and express the results as ppm of Mg²⁺ in theunknown sample.

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Disodium salt of ethylene diamine tetra acetic acid is used to determine the total hardness of the given hard water The hardness causing metal ions ie calcium and magnesium form a winered colored weak complex with Eriochrome Black T indicator in the presence of See Answer

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