Stoichiometry with Solutions Name ____________________
1. H3PO4 + 3 NaOH --> Na3PO4 + 3 H2O
How much 0.20 M H3PO4 is needed to react with 100 ml. of 0.10 M
NaOH?
2. 2 HCl + Zn --> ZnCl2 + H2
When you use 25 ml. of 4.0 M HCl to produce H2 gas, how many
grams of zinc does it react with?
What volume of H2 gas is produced at STP?
3. CaCO3 + 2 HCl --> CaCl2 + H2O + CO2
How much 0.80 M HCl would be needed to dissolve a CaCO3 pearl
which weighs 4.0 grams?
4. 3 Fe + 2 Au(NO3)3 --> 3 Fe(NO3)2 + 2 Au
Throwing some scrap iron in a gold nitrate solution causes the gold
metal to precipitate. How much 0.50 M gold nitrate solution would
react with 224 grams of iron metal?
5. Sea water is about 0.50 M NaCl. To produce Cl2 gas, a company
evaporates sea water, melts the NaCl, and runs electricity through it.
2 NaCl --> 2 Na + Cl2 How many liters of sea water are needed
to fill a tank car with 1,120,000 liters of chlorine gas at STP?
6. H3PO4 + 3 NaOH --> Na3PO4 + 3 H2O
If 36.0 ml. of H3PO4 react exactly with 80.0 ml. of 0.500 M NaOH,
what is the concentration of the phosphoric acid?
Answers: 1) 17 mL 2) 3.3 g of zinc and 1.1 L of H2 3) 0.10L 4) 5.3 L
5) 2.0 x105 L 6) 0.370 M