Question

# A student is asked to standardize a solution of barium hydroxide. He weighs out 0.925 g...

A student is asked to standardize a solution of barium hydroxide. He weighs out 0.925 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 28.5 mL of barium hydroxide to reach the endpoint.

A. What is the molarity of the barium hydroxide solution? This barium hydroxide solution is then used to titrate an unknown solution of perchloric acid.

B. If 26.0 mL of the barium hydroxide solution is required to neutralize 26.9 mL of perchloric acid, what is the molarity of the perchloric acid solution?

#### Homework Answers

Answer #1
• potassium hydrogen phthalate molecular wieght is 204.22 g/mol
• no. of moles of potassium hydrogen phthalate is 0.925/204.22 = 0.00453 moles
• 2 moles of potassium hydrogen phthalate requires 1 mole of barium hydroxide (since it is diacidic base).
• i.e., 0.00225 moles of barium hydroxide requires to nutralise 0.925 g of potassium hydrogen phthalate
• molarity of Ba(OH)2 is 0.00225/0.0285 = 0.079 M
• for neutralization formula is M1V1/N1 =M2V2/N2
• M1 = 0.079 m, V1 =26 mL, N1 = 2,  V2 = 26.9, N2 = 1, M2 = ?
• (0.079 X 26)/2 = (M2 X 26.9)/1
• 1.027 = M2 X 26.9
• M2 = 1.027/26.9 = 0.038 M
• molarity of perchloric acid is 0.038
Know the answer?
Your Answer:

#### Post as a guest

Your Name:

What's your source?

#### Earn Coins

Coins can be redeemed for fabulous gifts.

##### Not the answer you're looking for?
Ask your own homework help question
ADVERTISEMENT
##### Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

ADVERTISEMENT
##### Active Questions
• Are your finances, buying habits, medical records, and phone calls really private? A real concern for...
asked 9 minutes ago
• In triangle ABC, angle A measures 33 degrees. If angle C measures 38 degrees and BC...
asked 15 minutes ago
• Psychoactive medications (drugs that impact our thoughts, emotions, and behavior) usually work as either agonists or...
asked 16 minutes ago
• TATA-Pribnow box: Motifs TATAAA or TATAAT of six nucleotides, known as TATA boxes, are an essential...
asked 28 minutes ago
• Bond valuation​) You own a 10​-year, ​\$1000 par value bond paying 8 percent interest annually. The...
asked 56 minutes ago
• what does an RNA Induced Silencing Complex do: - dephosphorylate the G protein - Bind to...
asked 1 hour ago
• What is a “computer network”? Why are computer networks important to business? How do you see...
asked 1 hour ago
• Contrast the definition of psychology and the definition of law. Which definition is more clear-cut? Why...
asked 1 hour ago
• Lydia's aunt Rose left her \$5,000. Lydia spent \$1,000 on her wardrobe and deposited the rest...
asked 1 hour ago
• Define generalized anxiety disorder. Compare and contrast GAD with phobic disorders, noting how avoidance behavior is...
asked 1 hour ago
• Discuss some common cybersecurity risk response, change management, version control, and incident response processes that you...
asked 1 hour ago
• A person, is standing 2 meters away from a mirror in order to take a picture...
asked 1 hour ago