7. What is the Chemical formula of the substances present in cach of the followi

Question

7. What is the Chemical formula of the substances present in cach of the following household chemicals? (write only the formula) a. Baking Soda b. Epsom salts c. Table salts d. Bleach e. Houschold ammonia 8. A student weighed 0.2 g of unknown oxide into a 250 ml conical flask. 50.00 ml HCI was added immediately to the flask which reacted with the oxide. The excess HCI was then titrated with 0.05M NaOH (aq). Use the table and the equations below to answer the questions that follows MO +2H+ H2O +M -- +NaOH) a. (10pts)Complete the table below. Burette Reading (ml) Initial Final Titre 0.00 42.00 21.50 42.00 20.5 22.5 b. (5pts)Calculate the average titre c. (15pts)Calculate the moles of the NaOH that reacted in the titration. d. (15pts)Determine the moles of HCI that reacted with the base. Hel ////anny e. (20pts)Calculate the initial moles of HCI before the titration and hence the moles HCI that reacted with the oxide.

Explanation / Answer

c)

Moles of NaOH reacted = volume of NaOH x molarity of NaOH = 21.5 mL x 0.05 M = 1.075 mmol = 0.001075 mol

d)

Since one mole basse (NaOH) required to neutralize one mole acid (HCl), the number of moles of HCl reacted is the same as the number moles of NaOH reacted.

Moles of HCl reacted with base = 0.001075 mol

e)

Initial moles of HCl = volume of HCl x molarity of HCl = 50.00 mL x 0.1 M = 5.0 mmol = 0.0050 mol

Moles of HCl reacted with oxide = Initial moles of HCl - moles of HCl reacted with base

                                                    = 0.0050 mol - 0.001075 mol

                                                     = 0.003925 mol

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