Chemistry 120 -Homework #23
1. How many mL of 3.00 M HCl will be needed to dissolve 25.0 grams of aluminum metal according to the reaction
2 Al(s) + 6 HCl(aq) à 3 H2(g) + 2 AlCl3(aq)
2. Two solutions were mixed in a 400 mL beaker. The first solution was 25.0 mL of 0.174 M FeCl3 and the second was 62.8 mL of 0.123 M NaOH. Calculate the molarities of all ions in the resulting solution and the mass of any precipitate produced. If no precipitate forms, so state.
FeCl3(aq) + NaOH(aq) à
3. Phosphoric acid is made commercially by reacting sulfuric acid with phosphate rock which contains Ca3(PO4)2. the reaction equation is:
3 H2SO4(aq) + Ca3(PO4)2(s) à 2 H3PO4 + 3 CaSO4
How many liters of sulfuric acid solution are needed to react with 10.0 kg of phosphate rock given that the phosphate rock is 87.4% calcium phosphate. The acid solution is 28.0% H2SO4 and its density is 1.203 g/mL. You should assume that the other material in the rock is inert to the acid.