My Question) Why this calculation is wrong? I think this calculation is same with question 1. Isn't it? CaCO3 = 100g/mol, Ca = 40g/mol 100g CaCO3 has 40g Ca. 66.73 CaCO3 has 40/100 x 66.73mg Ca Ca = 26.70mg 26.70mg/1150mg x 100 = 2.32%
What's the differences between two questions?
Q1) How much calcium would you ingest by drinking one 8 oz glass of your tap water? Show all calculations.
-->Tap water 8Oz = 8 x 0.0296L = 0.2368L
Hardness = 66.73ppm = 66.73mg/L CaCO3
1L has 66.73mg CaCO3
0.2368L has 66.73mg x 0.2368 = 15.8017mg
MW of CaCO3 = 100g/mol
MW of Ca = 40g/mol
100g CaCO3 has 40gf of Ca
15.8017mg CaCO3 has 40/100 x 15.8017mg Ca
We would ingest 6.321mg of Ca.
Q2) What percentage of the recommended daily dose of calcium (1,150 mg/day) does 1.0 L of your water provide? Show all calculations.
--> 66.73mg/1150mg x 100 = 5.80%
My Question) Why this calculation is wrong? I think this calculation is same with question 1. Isn't it?
CaCO3 = 100g/mol, Ca = 40g/mol
100g CaCO3 has 40g Ca.
66.73 CaCO3 has 40/100 x 66.73mg Ca
Ca = 26.70mg
26.70mg/1150mg x 100 = 2.32%
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