Signed in as ruqayah alsheekh Help Resources previous 14 of 16 Part A Pyridine i

Question

Signed in as ruqayah alsheekh Help Resources previous 14 of 16 Part A Pyridine is a weak base th used in the manufacture of pesticides and plastic resins. It is also a component ofcigarette smoke. Pyidine ionizes in water as follows: The C5H5N H20 C5H5NH+ OH b of pyridine is 8.75. What is the pH of a 0.475 Msolution of pyridine? (Assume that the temperature is 25 Express the pH numerically to two decimal places. pH Submit Hints My Answers Give Up Review Part Part B Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid ionizes in water: CRH COOH CAH COO

Explanation / Answer

Answer :
pOH = 1/2(pKb -logc (Base))
Using given values as pKb= 8.75 and substituting in above equation
We get pOH = 1/2(8.75 - log(0.475))
Further solving
pOH = 4.53
pH = 14 - 4.53
pH = 9.46 units

Answer 2)

Using pH = 1/2(pKa - logc (Acid))
substituting values

pH = 1/2(4.2 - log(0.61)
pH = 1/2(4.42)
pH = 2.20 units

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