Question

Juan wants to dilute a 5 molar solution of sulfuric acid down to a 1 molar solution. What would be the best way for him to do this?

A.
Add 400 mL of water to a beaker filled with 100 mL of sulfuric acid.
B.
Add 400 mL of a base such as NaOH to 100 mL of sulfuric acid.
C.
Add 100 mL of sulfuric acid to a beaker filled with 400 mL of water.
D.
Add 100 mL of sulfuric acid to 400 mL of a base such as NaOH.

we haven't learned about molars at all! please help! :(

Answer 1

Do you have a periodic table? (with masses of the elements?)

Answer 2

Mhm

Answer 3

Basically, a mole of any molecule is the addition of the mass of all the element in that compound

Answer 4

ohhhh

Answer 5

Sulfuric Acid is
\[H_2SO_4\]
The mass of a hydrogen atom is 1
The mass of a sulfur atom is 16
The mass of an oxygen atom is 8

Answer 6

There are 2 hydrogen atoms, so you need to add both masses
Since there are 4 Oxygen atoms, you have to add the mass of it 4 times
\[1(2)+16(1)+8(4)\]

Answer 7

oh, okay that makes sense... so 3+16+34, right?

Answer 8

Yes, that is the molar mass of Sulfuric Acid

Answer 9

oohh, thank youu!

Answer 10

the question is a little simpler than you are making it ^_^

since we want to dilute the solution and not change its composition, we will not add base

for safety reasons, you always add ~acid to water~ making C the only viable option

Answer 11

I was thinking it was C but i wanted to make sure, thanks. :) i really appreciate it.