Question

A. Calcium is normally present at a concentration of about 0.1g/L. Calculate the Eq/L of Ca+ in the plasma (the atomic weight of calciumis 40). B. If it requires 7 drops of silver nitrate in procedure step 4d to tern the urine sample color from yellow at amber, what is choloride concentration, expressed in Eq/L units, of the urine?

Answer 1

A First convert the g/L into molarity (male /L) by dividing the with atomic weight. M = 0.1/40 = 2.5 m mol/L ca^+2 meq/L = 2(2.5 mmol/L) = 5 meq/L = 5 times 10^-3 = .005 eq/L B is it required 7 drops as silver nitrate [cl^-] = 7 times (61 mg of cl^-)/100 mL = 427 mgcl^- = 427 mgcl^-/100 ML (1 g/1000 mg) = (1000 mL/1L) (1 mole/35.5 g) (1000 mM/LM) = 120 mm times 1 (valence as cl^-) = 120 meq/L = 120 times 10^-3 eq/L