Question

8. A 0.700-g unknown mixture with CaCl2 reacts with aqueous sodium phosphate to give 0.425 8 Ca3(PO4)2. Refer to Example Exercise 15.2 and show the calculation for the percentage CaCl2 in the unknown mixture. DUTY in modo talentos Stan solo longo 9. What safety precautions must be observed in this experiment?

Answer 1

6.7009m + cacle ynknan mixture Ca3 (Poa)2 CNacl t 3 Caciz +2 Na3 PO4 1 mol 3 mol cacle 3 n casiPo4)2 . mass of CasC Po4)2 Produced O.425 m 1 1.37 X 163 mol Or425 mol of Ca3 CPO4)2 310.2 cache 3 ncaclz 1 1-37 xl-3 nca3 (PO4)2 3 X 1.37 X16-3 ncacle 4.11 x 16 m 17 mass of Caci2 ncacle moleculay weigtt of Caclz mcach 4. 11 X10-3 t1o.98

:. Mcacl2 116.98 X 4, || X 10 456.12 78 x 1o-3 m :. mass 0f Cac CPn unknown min.) 0.4561278 m 10f caclz marr of Cac12 mass of miY O04561218 x loo O0700 65.16111.