The concentration of Ca2+ ion present in a blood sample is found to be 4.5 mEq/L. How many milligrams of Ca2+ ion are present in 250.0 mL of the blood? mg Submit Answer Try Another Version 10 item attempts remaining
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Calcium levels in blood can be determined by adding oxalate ion to precipitate calcium oxalate, CaC2O4(1), following by dissolving the precipitate in aqueous acid(2) and titrating the oxalic acid (H2C2O4) with KMnO4(3): (1) Ca2+ + C2O42- → CaC2O4 (s) (2) 2H+ + CaC2O4 → Ca2+ + H2C2O4 (3) 5 H2C2O4 (aq) + 2 MnO4- (aq) + 6 H+ (aq) → 10 CO2 (g) + 2 Mn2+ (aq) + 8 H2O (l) How many milligrams of Ca2+ are present in 10.0 mL of blood if 25.08 mL of 0.000988 M KMnO4 solution is needed for the titration?
David C.
Calcium levels in blood can be determined by adding oxalate ion to precipitate calcium oxalate, $\mathrm{CaC}_{2} \mathrm{O}_{4}$, followed by dissolving the precipitate in aqueous acid and titrating the resulting oxalic acid $\left(\mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4}\right)$ with $\mathrm{KMnO}_{4}$ $\mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4}(a q)+2 \mathrm{MnO}_{4}^{-}(a q)+6 \mathrm{H}^{+}(a q) \longrightarrow$ $10 \mathrm{CO}_{2}(g)+2 \mathrm{Mn}^{2+}(a q)+8 \mathrm{H}_{2} \mathrm{O}(l)$ How many milligrams of $\mathrm{Ca}^{2+}$ are present in $10.0 \mathrm{~mL}$ of blood if $21.08 \mathrm{~mL}$ of $0.000988 \mathrm{M} \mathrm{KMnO}_{4}$ solution is needed for the titration?
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