1) State the purpose of the experiment and background. 2) General description of
ID: 837390 • Letter: 1
Question
1) State the purpose of the experiment and background.
2) General description of the experiment, remember to use past tense.
Determination of Sodium percarbonate concentration by Permanganate Analysis Steps 11-12 should be performed in triplicate (3 identical analyses performed side by side). Remember - sodium percarbonate is a skin irritant - wear a laboratory coat, safety glasses and disposable gloves! Weigh out accurately into a beaker a small amount of bleach powder (0.3-0.4 g) and record the weight. Add 1 M sulfuric acid solution until the fizzing ceases (around 3 mL). This is needed to neutralise the base present. Dilute this accurately to 100 mL in a volumetric flask with distilled water. Make a second dilution by accurately diluting 1 mL of your first solution to 25 mL. Prepare three 10 mL plastic tubes with 2.5 mL 1 M sulfuric acid and 2.5 mL potassium permanganate solution as before. To each tube add 1 mL of your diluted bleach powder solution. Make up to the 10 mL mark with distilled water and mix thoroughly. Measure the absorbance values as before. Using the average absorbance value from your triplicate analyses, determine: The number of moles of hydrogen peroxide in solution that reacted, using the equation from your previous plot. Calculate the concentration of hydrogen peroxide in your two solutions. Calculate the number of moles of hydrogen peroxide in the active oxygen laundry powder. Work out the % by mass of Na2CO3-1.5H2O2 in the laundry powder.Explanation / Answer
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