Question

Find the pH of the following solutions 36.45 g of HCl in 450.0 mL of water

Answer 1

assuming that the 36.45 was grams , then using molar mass.... find moles
36.45 gHCl @ 36.45 g/mol = 1mole of HCl

find molarity:
1 moles HCl / .45L = 2.22 Molar of HCl

which releases 100% of its ions = 2.22 Molar of H+
whose pH = .35

your answer is
.35 pH

Answer 2

Cross check me, I didn't use a calculator used my pc. lol

Answer 3

thank you

Answer 4

your welcome :)

Answer 5

quick question how did you get the ph

Answer 6

for [H+] you do -log(Molarity)

in this case, -log(2.22)

@kir8686

Answer 7

@alphadxg thank you again

Answer 8

Fan and medal if your question was answered :)

Answer 9

@alphadxg do u mind if i ask you another similar question?

Answer 10

yea

Answer 11

97.65 mg of NaOH in 375.0 mL of water

Answer 12

Well, look at the example we just did, only difference now is you have to convert 97.65 mg to grams, to do so we would just divide by 1000 to get grams. Then find the molar mass of Na, O, and H.

Answer 13

you try first.

Answer 14

97.65/1000= .98?

Answer 15

4.0 g of NaOH / 1 L

Answer 16

molar mass of naoh is 39.997 g/mol

Answer 17

One key thing to point out here, to get pH you need to get your answer to be in Molarity (Moles / L)

Answer 18

97.65mg NaOH / 1000g = .098grams NaOH
375ml / 1000L = .375L

To get molarity we would take .098grams NaOH / .375L = Molarity

ok good, we are in molarity, to find pH we would take

-log(Molarity) = pH

Answer 19

.58

Answer 20

umm I'm getting 2.18

Answer 21

.098/.375 i got .261333

Answer 22

Ok these are the conversion you need to do first, next we need to get this to molarity (Moles / L) We have L, now to find Moles we have grams of NaOH, now we need to multiply by the mass to get it into moles.

Now all we have to do is find pH