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Hank's solutions: Hank's solutions can be made from stock solutions (kept refrigerated, they will last for several months).  A premix of the salts can be stored in the refrigerator for several weeks.  Sodium bicarbonate does not store well, so it is made up fresh each time Hank's solution is made.

Full Strength Hank's: 0.137 M NaCl, 5.4 mM KCl, 0.25 mM Na₂HPO₄, 0.44 mM KH₂PO₄  , 1.3 mM CaCl₂  , 1.0 mM MgSO₄  , 4.2 mM NaHCO₃

Hank's Stock Solutions:
Stock #1  8.0 g NaCl 0.4 g KCl in 100 ml ddH₂O
Stock #2  0.358 g Na₂HPO₄ Anhydrous,  0.600 g KH₂PO₄ ,   in 100 ml ddH₂O
Stock #4  0.72 g CaCl₂  in 50 ml H₂O
Stock #5  1.23 g MgSO₄×7H₂O in 50 ml ddH₂O
Stock #6  0.35 g NaHCO₃ 10.0 ml ddH₂O

Hank's Premix:
Combine the following in order:
10.0 ml Solution #1, 1.0 ml Solution #2, 1.0 ml Solution #4, 86.0 ml ddH₂O, 1.0 ml Solution #5
Store Hank's Premix in the refrigerator along with the Hank's solutions.

Final Hank's:
9.9 ml Hank's Premix, 0.1 ml fresh Stock #6