2. a 50 ml solution containing 0.10 m 1-naphtoic acid (pka = 3.70)

2.  A 50 mL solution containing 0.10 M 1-Naphtoic acid (pKa = 3.70) and 0.15 M arsenic acid (pKa1 = 2.24; pKa2 = 6.96) is titrated with 0.20 M KOH.

(a)    How many end points will be observed?

(b)   What is the pH of the solution before adding any KOH?

(c)    Calculate the volume of KOH required to reach the first equivalence point.

(d)   Calculate the pH after the addition of 100 mL of KOH (assume that the OHcontribution from water autoprotolysis is negligible).

 

3.  Masking of Cu2+ can be achieved by reduction to Cu+.  A 25.00 mL aliquot of a solution containing Cu2+ and Ni2+ was treated with ascorbic acid at pH 3.0 to reduce the Cu2+ ions.  The pH was adjusted to 10.0 and 27.32 mL of 0.0565 M EDTA was required to reach a murexide end point.  In a parallel titration, 40.45 mL of 0.0565 M EDTA was required to reach the murexide end point in a 25.00 mL aliquot that was not treated with ascorbic acid.  What amounts of copper and nickel in ppt (mass/vol.) were in the original solution?

Calculate your order
Pages (275 words)
Standard price: $0.00
Client Reviews
4.9
Sitejabber
4.6
Trustpilot
4.8
Our Guarantees
100% Confidentiality
Information about customers is confidential and never disclosed to third parties.
Original Writing
We complete all papers from scratch. You can get a plagiarism report.
Timely Delivery
No missed deadlines – 97% of assignments are completed in time.
Money Back
If you're confident that a writer didn't follow your order details, ask for a refund.

Calculate the price of your order

You will get a personal manager and a discount.
We'll send you the first draft for approval by at
Total price:
$0.00
Power up Your Academic Success with the
Team of Professionals. We’ve Got Your Back.
Power up Your Study Success with Experts We’ve Got Your Back.