Question

How many liters of 5.4 M calcium chloride solution are required to react with 120 mL of 15 M phosphoric acid solution?

CaCl2 + H3PO4 → Ca3(PO4)2 + HCl

Answer 1

@Whitemonsterbunny17

Answer 2

I'm sorry, I don't know chemistry... :s
But I can help with English, Biology, History, Design, and some Economics... c:

Answer 3

OK

Answer 4

Sorry dont know this but I think he can help you -> @mrdoldum

Answer 5

OK

Answer 6

He's working with a question.

Answer 7

OH

Answer 8

@CrazyTown~JA

Answer 9

I am not taking chemistry till next year so I can't help sorry

Answer 10

ok

Answer 11

@douglaswinslowcooper

Answer 12

Tanya, first you need to write a balanced equation for the reaction,

a CaCl2 + b H3PO4 ---> c Ca3(PO4)2 + d HCl

must find a,b,c,d

if c =1, then a is probably 3 to get the Ca balanced on both sides

so we try

3 CaCl2 + b H3PO4 ---> 1 Ca3(PO4)2 + d HCl

that means d = 6 to get the Cl balanced on both sides

3 CaCl2 + b H3PO4 ---> 1 Ca3(PO4)2 + 6 HCl

and b =2 to balance the H on both sides and the (PO4)

3 CaCl2 + 2 H3PO4 ---> 1 Ca3(PO4)2 + 6 HCl

check to see have the right count: 3 Ca, 6 Cl, 6 H, 2 PO4, check

You need 2 moles of phosphoric acid [H3PO4] for every 3 moles of CaCl2.

How many moles of phosphoric acid are in 120 ml of 15 M?
Doesn't M stand for moles/liter? If so, then this is
[120ml][15moles/1000ml] = 1.8 moles.

the ratio of phosphoric / calcium chloride needed = 2/3

so, you have (5.4 moles/liter) CaCl2 in your solution.
Figure out how much of this solution you need to get
(3/2)(1.8 moles)=2.7 moles Ca to balance the phosphoric acid

Answer 13

Thank you very much @douglaswinslowcooper Outstanding job !!!! and thanks for the testimonial =')

Answer 14

You are vey welcome!

Answer 15

I'm still confused

Answer 16

What part puzzles you?

Answer 17

the explanation srry I'm not good at chem

Answer 18

@BMasterOB123

Answer 19

Try to ask a specific question about a part of the explanation that is unclear to you.

Answer 20

the whole thing i understand better when someone explains step by step

Answer 21

@lonnie455rich

Answer 22

I dont think there is any better way to explain it other than the way douglas did. At least i cant. sorry

Answer 23

ok