please explain! thank you! 13. (4 pts) Caffeine, a stimulant in coffee and tea, is a...
please answer both 12 and 13! and explain, thank you!!
12). (4 pts) Lactic acid builds up in has a pH of 1.9. What is the K, for the a In our muscles after a workout. A solution of 0.2 M lactic acid OR •X A 1.oxloly A) 0.187 B) 0.013 C) 8.5 x 10" D) 3.2 x 10 E) 1.6 x 10" 14 POH 13. ( 4 pts) Caffeine, a stimulant in coffee and tea, is a weak base...
What is the answer for 11, 12, and 14? and please show how you
calculate it!
11). (4 pts) What is the approximate degree of dissociation of a 0.5 M solution of butyric acid? 10g LHT Butyric acid is responsible for the odor in rancid butter and has a pKa of 4.82. 109ci.61x(0 A) 0.55 % B)4.5 % C) 5.5 % D) 99.9% E) None of these choices are correct. 12). (4 pts) has a pH of 1.9. What is...
i
would really appreciate a quick answer please, thank you
4. Answer the following question (13 marks) a. Caffeine (C&H 0N4O2) is natural stimulant most commonly found in tea, coffee and cacao plants. Calculate the percentage composition of the elements present. (5 marks) b. Question 4 continued. Calculate the mass of nitrogen in 20.6g of caffeine. (2 marks) c. The combustion of caffeine produces carbon dioxide; water and nitrogen gas. Determine the mass of carbon dioxide produced from the combustion...
can you explain . thank you !
Ala certain temperature, the data below were collected for the reaction 21CI+H2 -> 12 + 2HCI Determine the rate constant for the reaction H2 (M) ICHM) RATE (Ms) 02 0.00250 0.15 0.00188 02 000500 A B M5 x 10-2 B 0219 C.0875 D. 0.125 E 0625 F. answer not sted G.625 x 102 H 0.175 10.156 A 0.650 Mmonoprotic weak acid solution has a pH of 1.50. What is the pK, of this...
please solve 4 of them, thank you.
2. Buffer Questions (Do 4 of 5 problems---6 pts each) a. Three different weak bases and their Kh values are listed below in a table. Which one would be best to form a buffer with a pH of 8.50? Explain why, and numerical calculations are expected as part of your answer to receive full credit. K = K,K) = 1.0 x 10-14 Weak Base K, Value KPK ammonia (1,8 x 10 hydrazine 1.3...
I need help with all three questions please and thank
you!
*four
4. Consider the reaction: 2 SOX) + g) = 2 50 (8) A 2.0 L flask was filled with 0.0400 moles o. 00200 moles of O. At equilibrium 0.0296 moles of so, were found what is the equilibrium constant for this reaction? A) 2.556 x 10 + B) 3.664 x 10 C) 6.953 x 102 D) 9.964 x 102 E) 3.116 x 10 5. What is a conjugate...
Please help with solving Question 1 (A-C) Thank you!
Unless otherwise specified in the problem, you may assume that all solutions are at 25°C. 1. 50.0 mL of a pH 6.00 carbonic acid buffer is titrated with 0.2857 M NaOH, requiring 17.47 mL to reach the second equivalence point. a. Calculate the molarity of carbonic acid and bicarbonate in the original buffer. Carbonic acid: Bicarbonate: b. Calculate the pH of the solution after a total of 100.0 mL of 0.2857...
Need Help on 1-6 please
1. Mercury ions exit as the mercurous dimer Hg22+ and Hgt. If Hg22+ is in contact with liquid mercury, Hg (1), the following equilibrium is established: Hgt(aq) → Hg22+(aq) + Hg(1) K= 2.24x10-5 If a 0.15 M solution of Hgt is put in contact with liquid mercury, what will be the resulting equilibrium concentration of Hg22+? Show work a. 3.36 x 10-6 M b. 1.83 x 10-3 M c. 1.14 x 10-2 M d. 0.83...
both probelms please! show work thank you (:
1 pts Question 10 Consider the following reaction: 2NOBr(g) + 2NO(g) + Bra(s) A1 L vessel is initially filled with pure NOBr. After equilibrium is reached, the volume is increased to 2L, while the temperature was kept constant. This will result in a shift in the equilibrium position to the right such that more products are made a decrease in ko an increase in Ko two of these answers are correct a...
please explain how you got these answers!!
and me 17) (5 pts) Calculate the pH of a solution that is 0.15 Min ammonia (NH3) and 0.40 ammonium chloride, given the ionization constant of the base, kb, NH3 = 1.76 X 10 equilibrium reaction: NH3(aq) + H20 (1) 2 NH4(aq) + OH' (aq) A) 5.18 B) 8.82 C) 9.25 D) 9.50 E) 9.63 18) (5 pts) By far the most important buffer for maintaining acid-base balance in the blood is the...