The necessary moles of each compound are calculated to prepare the solution:
n HEPES = M * V = 0.021 M * 0.5 L = 0.0105 mol
n NaCl = 0.137 M * 0.5 L = 0.0685 mol
n KCl = 0.005 M * 0.5 L = 0.0025 mol
n Citrate = 0.05 M * 0.5 L = 0.025 mol
The required grams of each compound are calculated, according to its molar weight:
g HEPES = n * MM = 0.0105 mol * 238.3 g / mol = 2.50 g
g NaCl = 0.0685 mol * 58.44 g / mol = 4.00 g
g KCl = 0.0025 mol * 74.55 g / mol = 0.19 g
g Citrate = 0.025 mol * 258.1 g / mol = 6.45 g
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