10th Grade Chemistry?

[sunkissed]

1) Consider the following reaction:
2K3 PO4+ 3Ni Cl2-------->Ni3 (PO4)2 + 6KCl

What volume of 0.225 M K3 PO4 solution is necessary to completely react with 134 mL of 0.0112M of NiCL2?

2) A 10.0 mL sample of an unknown H3 PO4 solution requires 112 mL of 0.100 M KOH to completely react with he H3 PO4 according the following reaction. What was the concentration of the unknown H3 PO4 solution?

H3 PO4 + 3KOH-----> 3H2O+ K3 PO4

3) What is the minimum amount of 6.0 M H2SO4 necessary to produce 15.0 g of H2 according to the following reaction?

2Al + 3H2 SO4--------> Al2 (SO4)3 + 3H2


PLEASE SHOW YOUR WORKING SO I CAN SEE WHAT TO DO!!

THANKS

[Dr.A]

Moles NiCl2 = 0.134 L x 0.0112 =0.00150
Moles K3PO4 needed = 0.00150 x 2 / 3 =0.00100
V = 0.00100 / 0.225 =0.00444 L

Moles KOH = 0.112 L x 0.100 = 0.0112
Moles H3PO4 = 0.0112 /3 =0.00373
M = 0.00373 / 0.01000 L =0.373 M

Moles H2 = 15.0 / 2.016 g/mol =7.44
Moles H2SO4 = 7.44
V = 7.44 / 6.0 = 1.24 L