a) What is the recommended daily allowance (RDA) of calcium, in mg, assuming a 2

Question

a) What is the recommended daily allowance (RDA) of calcium, in mg, assuming a 2000 calorie diet for a 25 year old adult?

b) A student carries out part 1 of this experiment and finds the equation for his/her calibration curve to be:

E(mV) = 39.030 + 28.823 log[Ca2+]

For the second part of the experiment, the student measures 5.7517 g of dried milk, prepares 50.00mL of milk solution from the dried milk, and measures the potential of the milk solution to be -42.97 mV. If the student were to drink this milk solution, what percent of his/her RDA of Ca would be satisfied?

Explanation / Answer

a) 1000mg per day

b)[Ca2+] = 1.43*10^(-3) mol/lit.

Wt. of Ca2+ = 40* 1.43 * 10^(-3) = 0.057gm / lit =570mg / lit.

50 ml milk contains, 0.57*50 mg Calcium = 2.86 mg

% RDA satisfied = 2.86/1000 * 100 = 0.286 %

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