Question

How many liters of 0.85 M HCl solution would react completely with 3.5 moles Ca(OH)2?

Ca(OH)2(s) + 2 HCl(aq) yields CaCl2(aq) + 2 H2O(l)

1.5 L HCl(aq)
8.2 L HCl(aq)
2.1 L HCl(aq)
6.0 L HCl(aq)

Answer 1

@Nnesha

Answer 2

@e.mccormick

Answer 3

See the molar ratio from the balanced reaction? Telling you every time you use 1 mole of calcium hydroxide, you need \(two\) miles of HCl to react fully with it

Answer 4

@jfraser so c

Answer 5

No. The problem says you start with 3.5 moles of calcium hydroxide, so how many moles of HCl will fully react with that much? (Twice as much)

Answer 6

The balanced reaction tells us \(ratios\), not absolute amounts

Answer 7

@jfraser so d would be correct?

Answer 8

You're jumping. Stop jumping.

If you have to use 3.5 moles of calcium hydroxide, you must also use 7 moles of HCl.

But the question is asking about the \(volume\) of HCl solution needed.

The \(concentration\) of the HCl is 0.85mol/L

Answer 9

oh so b @jfraser thanks

Answer 10

Each 1L of solution contains only 0.85 moles of HCl

\[7mol HCl * \frac{1L HCl}{0.85mol HCl}\]

Answer 11

Ye