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An acid has Ka 3.1 10 10 What is the Kb for the conjugate base of this acid at 25 C Kw 1.0 10 14 at 25 C?
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∙ 14y ago
3.2 x 10-5
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∙ 14y ago
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An acid has Ka 2.5 10 4 What is the Kb for the conjugate base of this acid at 25 C Kw 1.0 10 14 at 25 C?
4.0 x 10-11
An acid has Ka equals 2.5 x 10-4 what is the Kb for the conjugate base of this acid at 25C Kw equals 1.0 x 10-14 at 25C?
4.0 x 10-11
A solution with a pH of 10 is a?
it is a base because : in the pH strip 1-7 is considered as an acid whereas 7-14 is taken as base. Since the pH is 10 it is a base.
What is the relationship between a weak electrolyte and a weak acid or base?
The strength of an acid is expressed by its Ka value (acid 'equilibrium' constant) or its derivative pKa value ( pKa=-log10[Ka] )The relation with the strength of the conjugate base, (Kb , pKb values) is as follows:Ka * Kb = 1.0*10-14 at 25oCpKa + pKb = 14.00 at 25oC
is the pH value of 2.8 acid or base?
Acid is 1-6 neutral is 7 and base is 8-14
An acid has Ka 2.5 10 4 What is the Kb for the conjugate base of this acid at 25 C Kw 1.0 10 14 at 25 C?
4.0 x 10-11
An acid has Ka equals 2.5 x 10-4 what is the Kb for the conjugate base of this acid at 25C Kw equals 1.0 x 10-14 at 25C?
4.0 x 10-11
A solution with a pH of 10 is a?
it is a base because : in the pH strip 1-7 is considered as an acid whereas 7-14 is taken as base. Since the pH is 10 it is a base.
A 0.025 M solution of a weak base gave a pH of 7.94 What is the Ka value of the acid that is conjugate to this base?
Answer: KA = 3.3*10-4At first calculate KB ,supposing that this is a monoprotic weak base (B-):[OH-]=1.0*10-(14-7.94) = 1.0*10-(6.06) = 8.7*10-7 and cB = 0.025This filled in, using KB = [OH-]2/ cB to get:KB = [8.7*10-7]2 / 0.025 = 7.59*10-13 / 0.025 = 3.0*10-11Finally get KA by using:KA*KB = KW = 1.0*10-14 (in water, at room temperature)this results in KA = 1.0*10-14 / 3.0*10-11 = 3.3*10-4
What is the relationship between a weak electrolyte and a weak acid or base?
The strength of an acid is expressed by its Ka value (acid 'equilibrium' constant) or its derivative pKa value ( pKa=-log10[Ka] )The relation with the strength of the conjugate base, (Kb , pKb values) is as follows:Ka * Kb = 1.0*10-14 at 25oCpKa + pKb = 14.00 at 25oC
What is the pka value for NaCN?
NaCN doesn't really have a pKa. In water it becomes Na^+ and CN^-. The CN^- is a base so it will have a Kb and pKb. If you want the pKa of the conjugate acid (HCN), you can find that from 1x10^-14/Kb.
is the pH value of 2.8 acid or base?
Acid is 1-6 neutral is 7 and base is 8-14
What is the base of an acid?
There's no such thing as a base of an acid! A base is a substance with a pH of 8-14, and an acid is a base with a pH of 0-6. A neutral substance has a pH of 7.
What is pH and what levels represent acid and base?
pH is a method of measuring how strong a base or acid is. It is on a scale of 1-14, 1 being very acidic and 14 being a very strong base. 7 pH is water and it is neither a base or an acid.
What is the definition of a strong acid?
An acid (often represented by the generic formula HA [H+A−]) is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a hydrogen ion activity greater than in pure water, i.e. a pH less than 7.0. That approximates the modern definition of Johannes Nicolaus Brønsted and Martin Lowry, who independently defined an acid as a compound which donates a hydrogen ion (H+) to another compound (called a base). Acids are described by a pKa which is essentially a hydrogen dissociation factor. Acids, discussed here in the general form HA, are proton (H+) donors and the pKa describes the dissociation behavior of that molecule. As a consequence, each acid exists in two species, the conjugate acid (HA) and the conjugate base (A-). When the pH is equal to the pKa of the molecule, the concentration of conjugate base is equal to that of conjugate acid and the molecule behaves in an acid/base equilibrium. A strong acid situation occurs when the molecule has completely dissociated to its conjugate base. As a consequence, every acid is considered a strong acid if the pH is 2 pH units higher or more than the pKa for the acid molecule. The 2 pH units is based on statistics. The best example is that of hydrochloric acid (HCl). The pKa of HCl is around -4. Since the pH scale is between 1 and 14, HCl completely dissociates regardless of the pH. For contrast, acetic acid has a pKa of about 4.76, and would act like a strong acid at pH's equal to or above 6.76, but would be a weak acid at all other pH's.
Find the complex conjugate of 14 plus 12i?
To find the complex conjugate of a number, change the sign in front of the imaginary part. Thus, the complex conjugate of 14 + 12i is simply 14 - 12i.
Does acid has a higher pH than base?
No, acid will have pH 1-6.9; 7 is neutral and 7.1-14 is a base.
