Question

How many grams of a stock solution that is 92.5 percent H2SO4 by mass would be needed to make 250 grams of a 35.0 percent by mass solution? Show all of the work needed to solve this problem.

Answer 1

@AccessDenied

Answer 2

@mathstudent55

Answer 3

@ganeshie8

Answer 4

@Kainui

Answer 5

35% by mass mean 35g H2SO4 per 100g of solution, so 250g of solution will contain 2.5 x 35g of H2SO4 = 87.5g H2SO4.

100g of stock solution contain 92.5 g H2SO4, so if you need 87.5 of H2SO4 you need to take (100/92.5) x 87.5 g of stock = 94.6g of stock solution

10.5 V = 0.98 x 3.0
V = 0.280 L

Answer 6

Check my math, otherwise that's your answer bud.

Answer 7

ok... thx:)

Answer 8

@Abhisar Check my math lol, I'm tired please.

Answer 9

where does 100g come from?

Answer 10

sorry, i suck at chemistry ;(

Answer 11

we assume because it is 35%, that it is out of 100grams.

Answer 12

Does that make sense?

Answer 13

oh ok

Answer 14

so is the first line the answer to the question? or does it include the V= 0.280 thing?

Answer 15

alpha?

Answer 16

If your teacher is looking for grams, then don't include the V = ignore that bottom section.

Answer 17

I only put that there, unless she asked for more then grams.

Answer 18

The V = is only to convert it to Liters instead of grams, but the question is only asking for grams of the stock solution.

Answer 19

Make sure you award a medal and fan, if your questions have been answered :)

Answer 20

ok

Answer 21

thx ;)