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For a weak acid, HA...HA ==> H^+ + A^-
Ka = [H+][A-]/[HA]
Plug these values into the Ka equation. You also must know the [HA] that you start with.
Solve for [H+]
Take -log [H+] = pH
Wiki User
∙ 6y ago
Wiki User
∙ 6y agoUse this relationship: Ka = [H+][A-] / [HA], where HA is the associated acid. Brackets mean molarity, which is concenctrion. For a monoprotic separation, H+ = A-. Solve for H+, then take the -log to get your pH.
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How can you calculate pka valve if pH is given?
How can you calculate pka valve if ph is given?
How do you derive pH values for weak acids?
Every acid has a constant, called the acid dissociation constant(or Ka), which shows how much the acid dissociates to form ions in water.For an acid, the general dissociation equation is:HA -------> H+ + A-Ka = (concentration of H+) times (concentration of A-) divided by (concentration of HA)The values for concentrations are the values AT EQUILIBRIUM, where the concentrations of all three substances remain the same.If HA was a strong acid, it would completely(or almost completely) ionize in water to form its ions. Therefore, you can say that the concentration of H+ ions in the solution equal the concentration of HA. From this, you can calculate the pH by using the formula pH = - log (H+).If HA was a weak acid, however, things would be different. The acid only partially ionize in water, so you cannot say that the concentration of H+ is equal to the concentration of HA.If you know the value of the acid dissociation constant, you can easily find the concentration of H+ in the solution, and in turn calculate the pH.You know that the amounts of H+ and A- are equal. If you know the concentration of the acid HA you put in, you can calculate the H+ .
PH mitric method for determination of stability constant?
Yes it can be determined by monitoring the change of the pH with time. Suppose you have a compound that is almost constant upto certain time but after some time the pH is getting decreased .So this is the point where your compound is degrading so at that pH calculate pKa and from there the stability constant.
What is the pH of 0.00182M?
Assuming the given molarity is that of H+ ions in solution, then the pH is given by: pH = -log[H+], so -log(0.00182) = 2.74, so that's an acid.
What is the pH of 0.10M HC2H3O2?
HCOOH is a weak acid. This in a solution will partially dissociate into its respective ions. pH = -log(H+) pH = -log(0.2) Put above number in your calculator to get your answer.
How do you calculate concentration of phosphoric acid?
You can do it with a pH probe, or, if you are given the Ka value for phosphoric acid, you can do some math and figure it out.
How do you calculate concentrations of both acid and base in a buffer solution when only given pH value example pH 7.5?
pH = - log [H+] Substitute and solve for [H+]: 7.5 = - log [H+] = 3.16E-8 That is the concentration of H+ ions. Depending on the acid, you calculate concentration of the acid based on this. Kw (dissociation constant) for water = 10^-14 Kw = [H+]*[OH-] Substitute and solve for the concentration of OH- = 3.16E-7 Depending on the base, you calculate the concentration of the base from this.
How can you calculate pka valve if pH is given?
How can you calculate pka valve if ph is given?
Trihydroxybenzoic acid is a not so weak acid with an ionization constant ka equals 0.021 calculate the H plus and the pH of a 0.050 molar solution?
H+ = 0.024 MpH = 1.63
Calculate the dissociation constant at the same temperaturen given that the PH of a 0.001 monobasic acid is 4.22 at 25 degrees Celsius?
Ka= (x)^2/(.001) X=[H3O+]=10^-PH=10^(-4.22)=6.02^-5 ka=(6.02^-5)^2/(.001)=3.63^-6
Calculate pH of 1.0 m acetic acid?
2.4
What is the pH of Hydrogen flouride?
There is no given pH for hydrogen fluoride or any other acid or base. pH depends on both how strong an acid or base is and how much of it is dissolved in a given amount of water.
Why HCN acid a weak acid?
its pH is 9.5 so its a week acid
How do you derive pH values for weak acids?
Every acid has a constant, called the acid dissociation constant(or Ka), which shows how much the acid dissociates to form ions in water.For an acid, the general dissociation equation is:HA -------> H+ + A-Ka = (concentration of H+) times (concentration of A-) divided by (concentration of HA)The values for concentrations are the values AT EQUILIBRIUM, where the concentrations of all three substances remain the same.If HA was a strong acid, it would completely(or almost completely) ionize in water to form its ions. Therefore, you can say that the concentration of H+ ions in the solution equal the concentration of HA. From this, you can calculate the pH by using the formula pH = - log (H+).If HA was a weak acid, however, things would be different. The acid only partially ionize in water, so you cannot say that the concentration of H+ is equal to the concentration of HA.If you know the value of the acid dissociation constant, you can easily find the concentration of H+ in the solution, and in turn calculate the pH.You know that the amounts of H+ and A- are equal. If you know the concentration of the acid HA you put in, you can calculate the H+ .
Ph value of sodium hydrogen carbonate?
Alkaline, but you need to know the concentration and the dissociation constant to calculate pH
How do you calculate a conjugate base of a acid solution?
You usually calculate it with a pH stick. Good question!!.
How much pH is in strong acid?
pH is not a measure of how strong an acid is. pH is a measure of the concentration of hydronium ions in a solution, which is dependent on both the strength of the acid or base and its concentration in a given solution.
