M NaOH should be added acid) to X 10-12. How many milliliters of 0202 M NaOH sho
ID: 548984 • Letter: M
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M NaOH should be added acid) to X 10-12. How many milliliters of 0202 M NaOH should be salicylic acid (2-hydroxybenzoic asio or 250 mL of 0023 3 M be how you would prepare exactly 100 mL of o, buffer. pH 550. Possible starting materials adjust the pH to 3.507 are pute picolinate pyridine-2-carboxylic acid, FM 123.1), 1 and I.o M NaOH. Approximately how many milliliters of the grams of Na,SO, (FM 142.04) should be ad sof sulfuric acid (FM 98.0S) to give 1.00L.of or NaOH will be required? 10-14. How many su how many grams d with pH 2.80 and a total sulfur (-SOi HSOHSO)s centration of 0.200 M? Polyprotic Acids and Bases 10-15. Phosphate, present to an extent of o.oi M. is one of the mai be as buffers in blood plasma, whose pH is 7.45. Would phosphate bin useful if the plasma pH were 8.5? 10-16. Starting with the fully protonated species, write the acid dissociation reactions of the amino acids glutamic acid and te rsine. Be sure to remove the protons in the correct order. Which we call glutamic 10.17. (a) Calculate the quotient IH,PO,/TH,PO;) in 00500M KH POme quotient forn compounds (b) Find the same quotient for 0.050OM K,HPO 10-18, (a) which two of the following compounds would you to make a buffer of pH 7.45: H,PO, (FM 98.00), NaH,PO 119.98). Na,HPO4 (FM 141.96), and Na,PO, (FM 163.94)? (b) If you wanted to prepare 1.00 L of buffer with a total concentration of 0.050 0 M, how many grams of each of the two selected compounds would you mix together? (c) If you did what you calculated in part (b), you would not get a PH of exactly 7.45. Explain how you would really prepare this buffer in the lab. 10-19. Find the pH and the concentration of each species of lysine in a solution of 0.010 0 M lysine HCI, lysine monohydrochloride 10-20. How many milliliters of 1.00 M KOH should be added to 100 mL of solution containing 10.0 g of histidine hydrochloride (His HCI, FM 191.62) to get a pH of 9.30? 10-21. (a) Using activity coefficients, calculate the pH of a solution containing a 2.00:1.00 mole ratio of HC2 C, where H,C is citric acid. Assume that ionic strength = 0.010 M. (b) What will be the pH if the ionic strength is raised to 0.10 M and the mole ratio HC-:C3-is kept constant? Which Is the Principal Species? 10-22. The acid HA has pKa = 7.00. (a) Which is the principal species, HA or A-, at pH 6.00? (b) Which is the principal species at pH 8.00? (c) What is the quotient [A-VIHA] at pH 7.00? at pH 6.00Explanation / Answer
12)
millimoles of salclyic acid = 25 x 0.0233
= 0.5825
pH = 3.50
pKa = 2.97
acid + NaOH ------------> salt
0.582 0.202V 0
0.582-0.202V 0 0.202 V
pH = pKa + log [salt / acid]
3.50 = 2.97 + log [0.202 V / 0.582-0.202V]
[0.202 V / 0.582-0.202V] = 3.388
0.202 V = 1.972 - 0.684 V
V = 2.225
volume of NaOH = 2.22 mL
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