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Can you explain step by step why this is so? Question 5 0/2 pts Which combination...
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Question 5 0/2 pts Which combination would make the MOST effective buffer solution? Correct Answer 0.1 M H2CO3 and 1.0 M NaHCO3 0.1 M H2CO3 and 2.0 M NaHCO3 0.15 MH2CO3 and 0.015 M NaHCO3 You Answered 0.1 MH2CO3 and 0.1 M NaHCO3
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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...
Which mass of which salt below should be dissolved in 0.20 M H2CO3 (Ka = 4.2*10-7) to make 500 mL of an appropriate buffer solution with pH = 5.76? (Assume constant volume during dissolution). a) 4.0 g NaHCO3 b) 8.0 g NaHCO3 c) 2.0 g NaHCO3 d) 5.1 g Na2CO3 e) 2.6 g Na2CO3 I know the answer is C. Can someone please explain how to get this answer, and please explain why it would be NaHCO3 instead of Na2CO3?...
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5. The value of Ke for reaction: H2(g) + 12 (9) + 2H1 (9) is 50.5. In what direction the reaction proceed if the initial concentrations are as follows? (a) [H2] = 0.015 M , [12] = 0.012 M , [HI] = 0.024 M (b) [H2) = 0.030 M , [12] = 0.060 M , [HI] = 0.15 M (c) [H2] = 0.002 M , [12] = 0.003...
Please help explain why this statement is false (genetics
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Question 35 0/2 pts Which of the following is FALSE? Correct Answer Plants during photosynthesis use the potential energy within water and inorganic nutrients to make high energy molecules such as glucose. Epigenetics can explain why two individuals with the same DNA nucleotide sequences can have different gene expression. Signal transduction pathways enable some plants to attract beneficial insects that can attack herbivorous caterpillars that are consuming...
6+ (20 pts.) You prepare a buffer by ading 0.I mol of Na,PO, and 0.15 mol of NaJHPO, to 1.0 L of water. (pKal-2.148, pk, 7.198, and pKas 12.375) a. What do you expect the pH to be? b. If instead you begin with 1.0 L of a 0.1 M solution of NaH2POs, how many ml of a 0.5 M KOH solution do you need to add in order to reach a pH of 9.5?
D Question 6 1 pts When equal volumes of the solutions are combined, which of the following produces a solution with the largest buffer capacity? 10 M HNO3 and 1.0 M NaOH O 1.0 M NaF and 1.0 M NaOH O 1.0MHF and 1.0 M NaOH O2.0 M HNO3 and 2.0 M LINO3 O 1.0M HF and 1.0 M LIF 1 pts Question 7 Equal volumes of 0.50 MHBr and 0.50 M NH3 are mixed together. The resunting solution can...
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Question 5 0/1 pts You invest a sum of money in an account that pays 7.62% compounded continuously. How many weeks must you leave this sum invested to double your money Express your answer in weeks to the nearest whole number of weeks You Answered 468 Correct Answer473.0 margin of error +/- 1.0
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Question 5 1 pts A student mixes HCl and NaCl (source of conjugate) and claims to have made a buffer. Is this claim accurate? Yes- it is a mixture of acid and conjugate base after all Yes- any acid with a conjugate can make a buffer Oo oo C No-the conjugate base is so weak it does not reach equilibrium with water Need more information Question 6 1 pts Which combination of acid and base would create a buffer? Assume...