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How do you do pH?

Updated: 8/11/2023
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13y ago

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In its most basic form pH = -log[H+] where [H+] is the concentration of hydrogen ions from the acid dissocating.

Given the acid dissocation constant and an inital concentration of the acid we can calculate [H+]

the most common calculation you will see when doing the maths is Ka[inital acid concentration] = [x2]

from this we get [H+] and sub into the first equation to get pH.

From pH we can get pOH, as pH + pOH = 14

From pOH we can get the antilog and calculate [OH-]

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13y ago
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13y ago

The pH of something is negative logarithm of the concentration of the hydrogen ions.

Basically...

log101/10,000,000 = -log1010,000,000

This means 10 to the power of what is 10000000. 107 = 10,000,000. So the pH is 7.

Kowalski

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15y ago

The short answer is to take the negative log of the concentration of Hydrogen atoms in solution (ie the concentration of the acid itself, if monoprotic), this is usually sufficient for strong acids that dissociate completely. For weaker acids you usually need to use the acid dissociation constant Ka of the acid at various levels of ionization. Once you've calculated the amount of H+ ions dissociated by the acid, you can use the negative log of that concentration to determine pH. The calculations are too lengthy to be provided here, but are available in most basic chemistry texts and online tutorials.

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14y ago

pH is a measurement you can not add it to water. Messing around with the pH of water containing fish can be a very dangerous thing to do. If you wish to increase or raise the pH from being acid you will need to add some form of alkaline substance like Sodium Bicarbonate ( NaHCO3) that is available at most pet shops.

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13y ago

pH is the negative log10 of the hydrogen (H+) (or hydronium: H3O+) ion concentration (moles/liter). Find the concentration, and it's then a very simple mathematical operation.

So if the hydronium ion concentration is 10-7 moles/liter then pH = -log10(10-7) = 7. See related link.

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13y ago

test it with Universal indicator, BTB or litmus paper. =)

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7y ago

One way is to get litmus paper, and dip it in your solution. The paper will turn the colour of the colour associated with the ph

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7y ago

Rather than litmus paper, which will only indicate acid or base, use pH test paper, or a pH meter.

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Anonymous

Lvl 1
3y ago

hydronium-ion concentration equals 2

moles/L

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