Answer:
1.1 percent
Explanation:
C6H5COOH⇌C6H5COO+H
Ka = [C6H5COO-][H+]/[C6H5COOH]
From pKa of 4.2, Ka = 6.3x10^-5
6.3x10^-5 = (x)(x)/0.51-x and assuming x is small...
6.3x10^-5 = x^2/0.51
x^2 = 3.213x10^-5
x =5.67 x10^-3
(5.67x10^-3/0.51)x 100 =1.1 percent
In a solution, when the concentrations of a weak acid and its conjugate base are equal, the -log of the concentration of H+ and the -log of the Ka are equal.
<h3>
What is Henderson-Hasselbalch equation ?</h3>
- This formula is frequently used to determine the pH of buffer solutions. A weak acid and its conjugate base make up buffer solutions.
- To find the pH of the buffer solution, we obtain the pKa of the weak acid and add it to the log of the concentration of the conjugate base divided by the concentration of weak acid.
- So whenever the concentration of the weak acid is equal to the concentration of the conjugate base, the pH of the buffer solution is equal to the pKa of the weak acid.
<h3 />
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Answer:
water
Acidity and basicity are usually determined in a solvent. The strongest acid in the solvent is always the conjugate acid of the solvent and the strongest base is the conjugate base of the solvent. So, in water, the strongest acid is H3O+ and the strongest base is OH- (conjugate base of water).
The gases have no definite shape, low density, and are highly compressible while the liquids only have a definite volume but no definite shape.
<h3>What is a Matter?</h3>
Any substance which has mass and occupies space is called matter. Commonly, there are three states of matter that are:
- Solid - Solids have a rigid shape, definite volume, and high density.
- Liquid - Liquids have definite volume but no definite shape. They take the shape of the container in which they are placed.
- Gas - Gases have neither definite shape nor definite volume and have low density. They completely occupy the container in which they are placed.
There are other two states of matter that are Plasma and man-made Bose-Einstein condensates. They are not so common.
Plasma is commonly found in the universe. Stars are the superheated balls of the plasma.
Thus, gases have no definite shape, low density, and are highly compressible. On the other hand, the liquids only have a definite volume but no definite shape.
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