Answers to following questions should be submitted with your final reports 1. Wh

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Answers to following questions should be submitted with your final reports 1. What is a polyprotic acid? What is a polyprotic base? If25.1mLof 0.1222 N NaOH is required to reach the first equivalence point of a solution of citric acid (H:CsHsO), how many mL of NaOH are required to completely neutralize this solution? 2. 3. What is the molarity of a 12 N H-C:0s solution? 4. How many moles and how many equivalents of HO' are present in 50mL of a 0.3 N 5. Why is it necessary to standardize a pH meter or the pH probe? 6. If the pH at one-half the first and second equivalence points of a dibasic acid is 3.20 and solution of H2SO4? 7.45, respectfully, what are the values for pkai and pK.? From pK,i and pk calculate the 7. Derive the relationship between pH and pK, at one-half the equivalence point for the 8. Could Kb for a weak base be determined in the same way that K, for a weak acid is 9. What is the relationship of the successive equivalence point volumes in the titration of a 10. The titration of a weak acid with NaOH showed two equivalence points. Using only this Kal and Kaz titration of a weak acid with a strong base. determined in this experiment? polyprotic acid? information determine the relationship between the molarity and normality of this acid solution. 11. Write the color of indicators and its pH ranges pH = 14.0 Phenolphthalein Methyl Orange Methyl Red WEEK 12 Acid and Base Tiration part II July 2017 Page 6ofs

Explanation / Answer

An acid that can furnish moré than one proton is called as polyprotic acid.

for example, H2SO4 is a polyprotic acid that can provide two proton (diprotic acid)

H2SO4 = 2H+ + SO42-  

A base that can accept more than one proton is called as a polyprotic base.

for example,

SO42- ion can accept two proton and hence it comes under this catagory (diprotic base )

PO43- ion can accept three proton and hence it comes under this catagory (triprotic base)

dirpotic, triprotic... etc are subclassification under polyprotic classification.

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