Fill in the blank. 5.22x10^-3 = [? ]x 10^-2
1 answer:
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Hello!
A solution of a weak acid and its conjugate base is called a buffer solution. It can resist the addition of bases and acids while maintaining the pH approximately constant.
To calculate the pH of a buffer solution, we'll use the famous Henderson-Hasselbach equation, applying the pKa value of the Benzoic Acid (4,20). In this equation, [A⁻] represents the concentration of the Conjugate Base and [HA] the concentration of the acid.
![pH=pKa + log( \frac{ [A^{-}]}{[HA]} ) \\ \\ pH=4,20 + log ( \frac{0,170 M}{0,245} ) \\ \\ pH=4,04](https://tex.z-dn.net/?f=pH%3DpKa%20%2B%20log%28%20%5Cfrac%7B%20%5BA%5E%7B-%7D%5D%7D%7B%5BHA%5D%7D%20%29%20%5C%5C%20%20%5C%5C%20pH%3D4%2C20%20%2B%20log%20%28%20%5Cfrac%7B0%2C170%20M%7D%7B0%2C245%7D%20%29%20%5C%5C%20%20%5C%5C%20pH%3D4%2C04%20)
So, the pH of the solution would be 4,04.
Have a nice day!
A solution of a weak acid and its conjugate base is called a buffer solution. It can resist the addition of bases and acids while maintaining the pH approximately constant.
To calculate the pH of a buffer solution, we'll use the famous Henderson-Hasselbach equation, applying the pKa value of the Benzoic Acid (4,20). In this equation, [A⁻] represents the concentration of the Conjugate Base and [HA] the concentration of the acid.
So, the pH of the solution would be 4,04.
Have a nice day!
Answer:
Mass of Fe = 32.55 g
Explanation:
Molar Mass of Fe atom = 55.845 g/mol
It means,
1 mole of Fe contains = 55.845 g ..............(1)
From mole concept,
<u>1 mole </u>of Fe contain = atom ..........(2)
Replace 1 mole in equation (2) by 55.845 g , it become :
55.845 g of Fe contain = atoms
Reverse the equation now
atoms of Fe contain =55.845 g
1 atom of Fe contain = g
atom contain =
on calculation,
atom contain = 32.55 g of Fe
Mass of Fe = 32.55 g