Illustrated Guide to Home Chemistry Experiments

128 DIY Science: Illustrated Guide to Home Chemistry Experiments

oALIpToN ACTIvITIES

If you have the time and the required materials, consider performing these optional activities:

• Table 7-1 lists compounds for which stock solutions are handy to have on hand in any lab. Among them, these
  compounds represent the most common cation and anion species we work with in this book. For each compound, look
  up the formula and formula weight (don’t forget to consider water of hydration) and enter it in the table. Look up the
  solubility of the compound and use it to determine an appropriate molarity for a stock solution. Calculate the mass of
  the compound that is required to make up 100 mL of the stock solution.


• For as many of these compounds as you have access to (and time available), mix up stock solutions. Record the actual
  mass that you use and determine the actual molarity of each of your stock solutions using the correct number of
  significant digits.

Compound Formula Formula Weight nominal M volume Calculated MassActual MassActual M

cupric sulfate pentahydrate CuSO 4 ·5H 2 O 249.68 g/mol 1.0 M 100 mL 25.22 g 25.34 g 1.005 M

aluminum nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

ammonium acetate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

ammonium chloride _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

ammonium molybdate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

ammonium nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

ammonium oxalate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

barium chloride _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

barium nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

calcium nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

chromium (III) nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

cobalt (II) nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

copper (II) nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

iron(III) nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

iron (II) sulfate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

lead nitrate _______.____ g/mol___.__ M100 mL _______.____ g_______.____ g___.______ M

Table 7-1:
Make up a molar solution of a solid chemical: observed and calculated data