I need help in writing experimental section for my chemistry lab report, this is

Question

I need help in writing experimental section for my chemistry lab report, this is the procedure..

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 Na2C03-1.5H2O2 in the laundry powder.

Explanation / Answer

Below, I have given a write up of how an experimntal section should be written in the lab report or evern in a paper. Please have a look :

Experimantal section :

C: Determination of Sodium percarbonate concentration by Permanganate analysis :

In a 100ml beaker, 0.3-0.4 g of bleach powder was taken. To this solution, 3ml of 1 M sulphuric acid was added to neutralize the base present. In a 250 ml volumetric flask, the reaction mixture was further diluted to 100ml using distilled water. Further, the as-prepared solution was diluted accurately using 1 ml of solution to 25 ml of final volume. Further, in three 10 ml plastic tubes, 2.5 ml each of 1 M sulphuric acid and potassium permanganate were added. 1ml of the diluted bleach solution was further added to each of these three tubes and the volume was made up to 10 ml with mixing them thoroughly. Absorbance of all the solution were measured and taking the average of the three solutions prepared, the following inferences were reported in the results and discussion section: (a) the number of moles of hydrogen peroxide in solution that reacted, (b) concentration of hydrogen peroxide in the two solutions, (c) number of moles of hydrogen peroxide in the active oxygen laundry powder, (d) mass % of Na2CO3.5H2O in the laundry powder.

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.