Chemistry Practice Molarity

1. A saline solution contains 2.50 mol of NaCl in 2L of water. What is the molarity? 2. What moles of Na2CO3 is needed to prepare 1.25 L of a 0.75M solution? pH, [H+], or [OH-] 3. Find the pH of each solution. a. [H+] = 1 x 10-4 M b. [H+] = 0.0015 M 4. Calculate the [H+] for each solution. a. pH = 5.00 b. pH = 12.83 5. Calculate the pH of each solution. a. [H+] = 5.0 x 10-5 M b. [OH-] = 8.3 x 10-10 M Balancing Chemical Equations 6. __ KClO3 ! __ KCl + __ O2 7. __ Ca + __ H2O ! __ Ca(OH)2 + __ H2 8. __ Fe + __ O2 ! __ Fe3O4 9. __ C6H14 + __ O2 ! __ CO2 + __ H2O 10. __ AlCl3 + __ AgNO3 ! __ Al(NO3)3 + __ AgCl 11. __ HCl + __ CaCO3 ! __ CO2 + __ H2O + __ CaCl2 12. __ WO3 + __ H2 ! __ W + __ H2O Mole Conversions 13. Find the molar mass of the following: a. KNO3 d. oxygen gas b. (NH4)2CO3 e. Ca(NO3)2 c. Ag2CrO4 f. PbSO4 14. Convert from g to moles or from moles to g. Show units. a. 12.0 g Fe to moles b. 25.0 g of Cl2 gas to moles c. 0.15 moles NaNO3 to g d. 0.0280 moles NO2 to g 15. Determine the moles of H2 from 2.5 moles of O2: 2 H2 + O2 ? 2 H2O 16.Determine the moles of O2 from 5 grams of H2O: 2 H2 + O2 ? 2 H2O 17. Determine the moles of H2 from 25 grams of O2: 2 H2 + O2 ? 2 H2O