can someone answer as much of these as possible please? 6. Calcium carbonate. Ca

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can someone answer as much of these as possible please?

6. Calcium carbonate. CaCo, reacts with stomach acid (HCl, hydrochloric acid) according to the following equation: CaCO3(s) +. 2 HCI(aq) CaCl2(aq) + Hd)(1) + COdg) One tablet of Tums, an antacid, contains 500.0 mg of CaCO. If one tablet of Tums is added to 20.0 mL. of a 0.100 M HCI solution, how many litres of gas would be produced at STP? (Hint- Limiting reagent!) Complete the following equations and determine if the products formed will precipitate out of solution: KCI(aq) + Pb(NO3)2(aq) 7. 8. Why can't you drink seawater if you were stranded on a desert island? 9. Explain why a bottle of Coca Cola kept in the refrigerator for a week will have more fizz" than onc that is kept at room temperature December 2015 3. The conductivity values of the water samples were very high. Conductivity indicates the oly tising al appopriate iler presence of electrolytes in the water s a mple, show using diagnns only how watcr molecules arrange themselves around electrolytes 6 marks (e) You believe that the electrolytes could be linked to the type of chemicals used by the farmers. They submitted their list with corresponding solubility and Kow values in this table Water Solubility (g/L at 20 C) 1900 1800 0.320 0.013 Log Kow (at 20°C) Purpose Fertilizer Fertilizer Insecticide Insecticide Compound Ammonium Nitrate rea Carbofuran Melathion 2.32 2.89 Identify one compound that may contribute to the occurrence of the electrolytes in the water. Why did you select this compound? (i) 2 marks]

Explanation / Answer

Q6

Find liters / V of CO2 gas produced:

mol of CaCO3 = mass/MW = 0.5 / 100 = 0.005 mol of CaCO3

mol of HCl = MV = (0.1)(20*10^-3) = 0.002 mol of HCl

ratio is 1:2 so

0.002 mol of HCl = 1/2*0.002 = 0.001 mol of CaCO3 reacts, HCl is limiting

0.001 mol of CaCO3 = 0.001 mol of CO2

at STP 1 mol = 22.4 L

0.001 mol = 22.4*0.001 = 0.0224 Liters of CO2

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