QUESTION 1 of the weak acid. The Stration curve of a weak acid that will be obta

Question

QUESTION 1 of the weak acid. The Stration curve of a weak acid that will be obtained in this experiment allows us to determine the O a none of the above b enthalpy change & denaity Od acid dissociation constant, K e.boirg port QUESTION 2 What volume of 0.455 M KOH solution is needed to neutraize 820 mL of 0.150 M solution of nitrous ack? Oa 27.0m Top of Form Bottom ef Form b. 249 ml O 82.0m Od 410mlL QUESTION 3 he point where 10.0 mL of KOH has been adsed during the tration? K for butyrie aoid ib 14x 10 What is the ratio of conjugate base to weak ackd, A 10.0 ml sample of 0.75 M butyric acid is titrated with Q.50 M KO Oa.2.0 0e 1.5 od.1.0 QUESTION 4 A solution is prepared using the formic acidformate (HCHO2/CHO2) acid base pair. The ratio of acid to base is 3.0 and K for fomic acid is 1.9x 104 What is the pH of the soution? 08420 324 0.09

Explanation / Answer

Q1- (d) option

Q2- (a) option

number of milliequivalents of nitrous acid = M X V = 0.15 X 82 = 12.3

which should be equal to milliequivalents of KOH for neutralization

12.3 = M X V (for KOH) = 0.455 x V

v= 27 mL

Q3- (a) option

total milliequivalents of acid = M X V = 0.75 X 10 = 7.5

number of equivalents of KOH added = M X V = 0.5 X 10 = 5

5 milliequivalents of both react completely

therefore, number of milliequivalents of conjugate base A- formed = 5 ; and that of acid left = 7.5 - 5 = 2.5

total volume = 20 ml

hence, concentration = milliequivalents/volume

hence, conc. of A- = 5/20 = 0.25

conc. of acid = 2.5/20= 0.125

ratio = 2

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