Which one makes a good buffer with a pH of 5? a) H2C2)4 b) H3AsO4 c) H2C2H3O2 d)HOCl
Which one makes a good buffer with a pH of 5? a) H2C2)4 b) H3AsO4 c)...
A reaction occurs at a pH of approximately 5. Which of the following buffer systems would be best used to make a solution with this pH? Select one: a. [CH3COOH] :[CH3COO-] b. [H2PO4-]: [HPO42-] c. [H2CO3] :[HCO3-] d. none of these.
Indicate the pH range that selected the following buffer systems: a) NH3 / NH4Cl b) HOCl / NaOCl
4) Which of the following pH values indicate a neutral solution? (a) pH=2 (b) pH=5 (c) pH=7 (d) pH=9 5) Which of the following forms a solution with a pH of 13.7? (a)0.02M solution of NaOH (b) 0.04M solution of Mg(OH)2 (c) 0.2M solution of HCl (d) 0.5M solution of NaOH 6) Which of the following forms a solution with a pH of 13? (a) 0.01M solution of NaOH (b) 0.03M solution of HCl (c) 0.05M solution of Ba(OH)2 (d)...
Which weak acid should be used to create a buffer at pH= 4.7 "Carbonic, H2CO3, Ka = 4.30×10–7" "Hypochlorous Acid, HOCl, , Ka = 3.50×10–8" "Hypobromous Acid, HOBr, Ka = 2.00×10–9" "Chloroacetic Acid, CClH2O2H, Ka = 1.36×10–3" "Lactic Acid, C3H6O2, Ka = 1.38×10–4" "Acetic Acid, CH3O2H, Ka = 1.75×10–5"
Given 100.0 mL of a buffer that is 0.50 M in HOCl and 0.74 M in NaOCl, what is the pH after 10.0 mL of 1.0 M NaOH has been added? (Ka for HOCl = 3.5 × 10–8) Select one: a. 7.78 b. 7.46 c. 7.72 d. 7.66
1) Which of the following aqueous solutions are good buffer systems? . a. 0.29 M hydroiodic acid + 0.20 M sodium iodide . b. 0.12 M barium hydroxide + 0.29 M barium chloride . c. 0.14 M nitrous acid + 0.12 M potassium nitrite . d. 0.34 M ammonium nitrate + 0.36 M ammonia . e. 0.31 M hydrofluoric acid + 0.29 M potassium fluoride . 2)A solution contains 0.486 M NH4I and 0.480 M ammonia. The pH of this...
can some one show me how to do question number 5 calculate pH of orignal Buffer B. Study of Buffers 3.S03 1. Mass of Sodium Acetate (NaC2Hs02) 2. pH of Original Buffer 41.38 3. pH of Buffer+ HC 4. pH of Buffer +NaOH 5. Calculated pH of Original Buffer (Show calculations below) A. pH of Salt Solutions pH Solution measured Ion Hydrolyzed Ionization of Salt 27 NH 4 NaHSO4 .35
which of the following acid should be used to prepare a buffer with a pH of 9.0? Which of the following acids should be used to prepare a buffer with a pH of 9.0? A. CH3COZH, K, = 1.8 x 10-5 B. H2CO3, K4 = 4.3 x 10-7 C. HF, K, = 6.6 x 10-4 D. HCIO, K, = 3.0 x 10- E.HCN, kg = 6.2 x 10-10
Which of the following buffer pairs would do the best at resisting pH change at a pH of 5? Select one: a. H2PO4− and HPO4−2 b. CH3COOH and CH3COO− c. NH4+ and NH3 d. There is not enough information to tell.
1. Calculate the pH of IL solution to which 5.OmL of 1.0 Macetic acid and 5.OmL of 0.5M sodium acetate have been added. The pKa of acetic acid is 4.76. 2. You need to carry out an enzymatic reaction at pH-3.5. A friend suggests phosphate buffer with pka of 7.21 as the basis of a buffer. Will this be a good choice to make the suitable buffer? Why or why not? 3. Calculate the concentration of acetate in a 100mM...