a) 0.400 mol/L
b) 9.20 ppt
c) 91.96 ppm
Explanation:
The first step is considereing the dissociation of the salt in water:
Na₂CrO₄ (s) → 2Na⁺ (aq) + CrO₄²⁻ (aq)
This means that for every mol of Na₂CrO₄ 2 mol of Na⁺ will be produced.
a) molarity
For Na₂CrO₄:
The molarity of Na will be the double of the molarity of the molarity of Na₂CrO₄:
b) parts per thousand (ppt)
c) parts per million (ppm)
0.400 mol Na ____ 1000 mL solution
x ____ 10 mL solution
x = 0.004 mol Na
The new solution has a concentration of Na of 0.004 mol/L.
ppm = mg/L
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