November 24, 2024, 11:47:15 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Volumes for pH adjustment  (Read 1895 times)

0 Members and 1 Guest are viewing this topic.

Offline MarinaSchnider

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
Volumes for pH adjustment
« on: March 16, 2020, 04:14:46 PM »
How do I calculate the volume of KOH 50% to be added into a pH=4 solution in a volume of 1 liter in order to raise the solution's pH to pH=6?
Logged

Offline chenbeier

  • Sr. Member
  • *****
  • Posts: 1337
  • Mole Snacks: +102/-22
  • Gender: Male
Re: Volumes for pH adjustment
« Reply #1 on: March 16, 2020, 04:30:33 PM »
Calculate the H+ concentration for both pH.
Then calculate the difference of them. This is amount what has to be neutralized.
Then you have to figure out what is the concentration in 50% Solution KOH and work it out.
The problem is, what kind of acid do you have. Some work as buffer.
Logged

Offline MarinaSchnider

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
Re: Volumes for pH adjustment
« Reply #2 on: March 16, 2020, 04:34:05 PM »
The acid is unknown...
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27861
  • Mole Snacks: +1813/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Volumes for pH adjustment
« Reply #3 on: March 16, 2020, 06:15:32 PM »
Quote from: MarinaSchnider on March 16, 2020, 04:14:46 PM
How do I calculate the volume of KOH 50% to be added into a pH=4 solution in a volume of 1 liter in order to raise the solution's pH to pH=6?

Quote from: MarinaSchnider on March 16, 2020, 04:34:05 PM
The acid is unknown...

Not enough information then (unless you are expected to assume it is a strong acid, 100% dissociated).
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info
Pages: [1]   Go Up
« previous next »
Sponsored Links