51) What is the pH of a solution made by mixing 30.00 mL of 0.10 M acetic acid with 40.00 mL of 0.10

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51) What is the pH of a solution made by mixing 30.00 mL of 0.10 M acetic acid with 40.00 mL of 0.10 M KOH? Assume that the volumes of the solutions are additive. Ka = 1.8 × 10-5 for CH3CO2H.

A) 8.26

B) 9.26

C) 11.13

D) 12.15

52) Which of the following titrations result in an acidic solution at the equivalence point?

A) CH3COOH titrated with NaOH

B) KF titrated with KOH

C) HCl titrated with NaOH

D) C5H5N titrated with HCl

53) Sodium hypochlorite, NaOCl, is the active ingredient in household bleach. What is the concentration of hypochlorite ion if 20.00 mL of bleach requires 28.30 mL of 0.500 M HCl to reach the equivalence point?

A) 0.208 M

B) 0.353 M

C) 0.708 M

D) 1.21 M

54) What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.50 M HCl? Ka = 3.0 × 10-8 for HOCl.

A) 0.30

B) 3.18

C) 3.76

D) 4.03

55) What is the pH of the resulting solution if 25 mL of 0.432 M methylamine, CH3NH2, is added to 15 mL of 0.234 M HCl? Assume that the volumes of the solutions are additive. Ka = 2.70 × 10-11 for CH3NH3+.

A) 3.11

B) 3.74

C) 10.26

D) 10.89

56) Sulfurous acid, H2SO3 has acid dissociation constants Ka1 = 1.5 × 10–2 and Ka2 = 6.3 × 10–8.  What is the pH after 10.00 mL of 0.1000 M NaOH is added to 10.00 mL of 0.1000 M H2SO3?

A) 1.82

B) 3.60

C) 4.51

D) 7.20

57) Oxalic acid, H2C2O4 has acid dissociation constants Ka1 = 5.9 × 10–2 and Ka2 = 6.4 × 10–5.  What is the pH after 20.00 mL of 0.0500 M NaOH is added to 5.00 mL of 0.2000 M H2C2O4?

A) 1.23

B) 2.10

C) 2.70

D) 4.19

58) The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid, H2X+) are and What is the pH of 50.00 mL of a 0.0500 M solution of alanine after 25.00 mL of NaOH has been added?

A) 2.34

B) 4.85

C) 6.02

D) 6.72

59) The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid, H2X+) are and //<[CDATA[ (function(){window.pagespeed=window.pagespeed||{};var a=window.pagespeed;function b(){}b.prototype.a=function(d,e,c){if(d=document.getElementById(d))if(e=document.getElementById(e))if(c=document.getElementById(c))e.src=d.getAttribute("src"),c.parentNode.removeChild(c)};b.prototype.inlineImg=b.prototype.a;a.b=function(){a.dedupInlinedImages=new b};a.dedupInlinedImagesInit=a.b;})(); pagespeed.dedupInlinedImagesInit(); ////<[CDATA[ pagespeed.dedupInlinedImages.inlineImg(&#39;pagespeed_img_d9EGt46anz2&#39;,&#39;pagespeed_img_d9EGt46anz5&#39;,&#39;pagespeed_script_6&#39;); // What is the pH of 50.00 mL of a solution of alanine after 37.50 mL of 0.100 M NaOH has been added? A) 4.85 B) 6.02 C) 7.39 D) 9.70 60) The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid H2X+) are //<[CDATA[ pagespeed.dedupInlinedImages.inlineImg(&#39;pagespeed_img_xMe8vlhrJm4&#39;,&#39;pagespeed_img_xMe8vlhrJm8&#39;,&#39;pagespeed_script_9&#39;); // and //<[CDATA[ pagespeed.dedupInlinedImages.inlineImg(&#39;pagespeed_img_d9EGt46anz2&#39;,&#39;pagespeed_img_d9EGt46anz10&#39;,&#39;pagespeed_script_11&#39;); // What is the pH of 50.00 mL of a 0.100 M solution of alanine after 100.00 mL of 0.100 M NaOH has been added? A) 9.70 B) 10.69 C) 11.85 D) 12.70  

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