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The dissociation constant, or Kw of water, is related to the pH of a neutral solution in that the pKw is equal to 14 which is equal to the sum of the pH and the pOH. Because the pKw of water is equal to 14, a neutral solution which has the same concentration of hydroxide and hydrogen ions will have a pH of 7.
Wiki User
∙ 9y ago
Wiki User
∙ 14y agoWhat is the relationship between acid dissociation and ph?
When an acid dissolves in water it forms Hydronium ions (H3O^+1) and the anion of the acid. The hydronium ion is the ion that removes rust from metals. It is the attacker, the anion is present just to balance the +1 charge.
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Dissociation means, when the acid is dissolved in water, the H^+1 ion separates from the anion of the acid producing H3O+1 ions and the anion of the acid. Strong acids are strong because they release most of the H+1ions to react. A weak acid, such as acetic acid (vinegar) releases very few H+1's to react. Acetic acid (HC2H3O2), has a dissociation constant of 1.8 * 10-5.
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The dissociation constant, Ka, describes the number of H+ ions that will separate from the ion compared to the number of acid molecules present in the beginning.
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The equation for dissolving ascetic acid in water is
HC2H3O2 + H2O = H3O+1 + C2H3O2^-1
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Here is the general equation for an acid with 1 H.
Ka = [H^+1] * [A^-1] ÷ [HA]
The brackets […] mean moles per liter.
Ka is the dissociation constant.
We use this equation to determine the concentration of H3O+1 ion in moles/liter to determine pH.
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Ka for acetic acid = 1.8 * 10-5
Below is the equation for acetic acid dissociating in water.
HC2H3O2 + H2O = H3O+1 + C2H3O2^-1
When one acetic acid molecule dissociates it produces 1 H3O+1 ion and 1 C2H3O2^-1 ion, so the concentration of H3O+1 ions equals the concentration of C2H3O2^-1 ions.
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Let x = the concentration of H3O+1 ions produced. The C2H3O2^-1 ion concentration also equals x, since one acetic acid molecule dissociates producing 1 H3O+1 ions and 1 C2H3O2^-1 ion
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For a 0.1 molar solution of acetic acid the dissociation equation is as follows:
Ka = [H3O+1] * [C2H3O2^-1] ÷ [HC2H3O]
1.8 * 10-5 = [x]*[x] ÷ 0.1
1.8 * 10-5 = x^2 ÷ 0.1
1.8 * 10-6 = x^2
x = (1.8 * 10-6)^0.5
x = 0.00424
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x = [H3O+1, the concentration of H3O+1 ions produced
pH = -log of [H3O+1] ions in solution
pH = -log 0.00424
pH = 2.37
A .1 molar solution of HCl, which is a strong acid, assuming it completely dissociates, has a pH = 1
This means the smaller the dissociation constant, the higher the pH. The higher the pH, the less acidic the solution is.
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∙ 9y agoDescribe the relationship between Hydrogen ions and pH?
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What is the pH of dicarboxylic acid?
The pH could vary from 1 to 5 depending on the nature of the acid. And each dicarboxylic acid will have two pH values for the dissociation of the two acidic protons.
Why HCN acid a weak acid?
its pH is 9.5 so its a week acid
PH of acetic acid in 250M solution?
get the moles of hydrogen ions present in the solution by writing down the acid dissociation formula of the acid. Find the concentration of hydrogen ions present in the solution. Use -log[H+] to get the pH.
What is the relationship between dissociation and the strength of an acid or base?
pH value is a line that start from o pH and finish it at 14 pH. From 0 to 6.9 consider as acid side 7.0 is a neutral point at next side 7.1 to 14 it is consider that base side solution. but 0 to 03 called high acidic solutions and 11 to 14 high basic solutions. now it is clear that pH have deep relation with acid and base.
What is the pH of fluorosulfuric acid?
The pKa of the fluorosulfuric acid is -10; HSO3F is a very strong acid, a so-called superacid. Ka is the dissociation constant; pKa is the decimal logarithm of Ka.
What is the pH of dicarboxylic acid?
The pH could vary from 1 to 5 depending on the nature of the acid. And each dicarboxylic acid will have two pH values for the dissociation of the two acidic protons.
What is the relationship between acid salt and base does it have to do with pH levels?
Yes the pH levels are different
Why HCN acid a weak acid?
its pH is 9.5 so its a week acid
PH of acetic acid in 250M solution?
get the moles of hydrogen ions present in the solution by writing down the acid dissociation formula of the acid. Find the concentration of hydrogen ions present in the solution. Use -log[H+] to get the pH.
What is the relationship between dissociation and the strength of an acid or base?
pH value is a line that start from o pH and finish it at 14 pH. From 0 to 6.9 consider as acid side 7.0 is a neutral point at next side 7.1 to 14 it is consider that base side solution. but 0 to 03 called high acidic solutions and 11 to 14 high basic solutions. now it is clear that pH have deep relation with acid and base.
What is the pH of fluorosulfuric acid?
The pKa of the fluorosulfuric acid is -10; HSO3F is a very strong acid, a so-called superacid. Ka is the dissociation constant; pKa is the decimal logarithm of Ka.
What is the approximate pH level in gastric acid?
The Ph of stomach acid is between 2 Ph and 3 Ph
PH of an acid?
pH of acid falls between 1 and 7, generally.
What is the pH of concentrated sulfuric acid?
Sulfuric acid can not be defined by a single pH, and can only have a pH as such when it is in a solution of water, where the pH is a measure of the hydrogen ion concentration: pH=-log10(H+) which occurs from dissociation.The pH of sulfuric acid in water, and any other acid in water, for that matter depends upon its concentration (moles of the acid per litre of the acid/water mixture, where 1 mol is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12). We usually say that 'X' mol L-1 of a substance has a pH of 'Y'.For the case of sulfuric acid, first consider its dissociation. Sulfuric acid is diprotic, meaning that it has 2 ionizable hydrogen atoms per molecule and dissociates in a 2-step process:H2SO4 → H+(aq) + HSO4−(aq)The second step in dissociation is:HSO4− → H+(aq) + SO42−(aq)The dissociation is not as straightforward as it may appear since the completeness of the dissociation in each case is governed by Ka values (dissociation constants), which are different for each step: one proton is a strong acid and dissociates completely (i.e., dissociation in the first step is complete), and the other is a weak acid and does not (i.e., dissociation in the second step is not complete). Without going in to unnecessary detail (which only a chem major would need to worry about), we'll assume that dissociation in the second step is negligible, and hence we consider one H+ in our calculation of pH.X mol L-1 H2SO4 therefore produces X mol L-1 H+.The pH of X mol L-1 H2SO4 is therefore:pH = -log10(X)Hence, if we have, for example, a 0.2 mol L-1 H2SO4 solution, it has a pH of -log10(0.2)=0.7. A higher concentration of sulfuric acid will have an even lower pH.
What is the Ph value for 0.005N H2SO4?
It is related to concentration, which you do not give.
What makes an acid an acid?
Its PH level. ---- An acid has a pH level between 0-6. Bases have a pH level between 8-14 A neutral that is niether acidic nor basic has a pH of 7.
What are the similarities between strong acids and weak acids?
Weak acid dissociation reactions do not go to completion, while strong acid dissociation reactions effectively do. Weak acids have a larger value of pKa than strong acids.
