#10 6. 2.5g of KCl is dissolved in water. In this mixture, water is referred to as theA) hydrogen bond donorB) solventC) soluteD) solution7. Caitlin and Brandon are both hyperventilating. Caitlin breathes into a paper bag, while Brandondoes not. Which statement belowA) Brandon's blood is likely to be more acidic and have lower CO2 levels compared to Caitlin.B) Caitlin's blood is likely to be more acidic and have higher CO2 levels compared to Brandon.C) Brandon's blood is likely to be more acidic and have higher CO2 levels compared to Caitlin.D) Caitlin's blood is likely to be more acidic and have lower CO2 levels compared to Brandon.s most accurate?8. What is the molarity of an H2SO4 solution if 12.5 mL of 0.28 M NaOH are needed to neutralize25.0 mL of the sample?A) 1.1 MB) 0.56 MC) 0.07 MD) 0.14 M9. An unknown amount of water is added to 75 mL of a 3.5 M aqueous glucose solution. What can besaid about the concentration of the resulting solution?A)The concentration of the resultant glucose solution will be greater than 3.5 M.B) It is impossible to say anything about the concentration of the resultant glucose solutionbecause the amount of added water has not been provided.C) The concentration of the resultant glucose solution will be less than 3.5 M.D) The concentration of the resultant glucose solution will remain the same because the amountof glucose has not changed.10. Consider a buffer prepared from the weak acid HF and its conjugate base F (shown below). Whathappens to the concentration of HF when a small amount of base is added to the buffer?HF(aq) + H,O(1) F(aq) + HO*(aq)A) [HF] increases initially, then decreases gradually as the components mix.B) [HF] increasesC) [HF] stays the sameD) [HF] decreases11. A saline solution used in intravenous drips for patients who cannot take oral fluids contains 0.92%(w/v) NaCl in water. How many grams of NaCl are contained in 575 mL of this solution?A) 1.6 g NaClB) 53 g NaClC) 0.016 g NaClD) 529 g NaClE) 5.3 g NaCl12. What is the molarity of a solution made by dissolving 3.09 moles of NaCl in 1.50 L of solution?A) 0.673 M NaClB) 4.64 M NaCIC) 4.85 M NaClD) 2.06 M NaCl10H (8VERSION 1

Answered: Image /qna-images/answer/90026e2e-8c66-44bc-8230-20ea5f17d74b.jpg

10. Consider a buffer prepared from the weak acid HF and its conjugate base F (shown below). What happens to the concentration of HF when a small amount of base is added to the buffer? HF(aq) + H,O(1) F(aq) + HO*(aq) A) [HF] increases initially, then decreases gradually as the components mix. B) [HF] increases C) [HF] stays the same D) [HF] decreases

10. Consider a buffer prepared from the weak acid HF and its conjugate base F (shown below). What happens to the concentration of HF when a small amount of base is added to the buffer? HF(aq) + H,O(1) F(aq) + HO*(aq) A) [HF] increases initially, then decreases gradually as the components mix. B) [HF] increases C) [HF] stays the same D) [HF] decreases

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter12: Chirality

Section: Chapter Questions

Problem 10CTQ

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what is the atomic number for Ph, and why does CH2Br have 2 priority over Ph and CH3?
7:51 Question 19 of 25 Submit A solution of the amino acid Lysine is at pH 13. What will be the overall charge, the charge on the two functional groups, and the R group? Lysine has a pl of 9.74 A) The side groups will be -COO¯ and -NH3*. The R group will be -NH3* Overall the charge will be +1. B) The side groups will be -COOH and -NH3*. The R group will be -NH3*. Overall the charge will be +2. C)The side groups will be -COOH and -NH2. The R group will be -NH2. Overall the charge will be neutral. D) The side groups will be -COO¯ and -NH2. The R group will be -NH2. Overall the charge will be -1. E) The side groups will be -COO¯ and -NH3*. The R group will be -NH2. Overall the charge will be neutral.
A buffer solution is prepared by taking 0.216 moles of acetic acid (pK₂ = 4.87) and 0.830 moles of sodium acetate in sufficient water to make 1.551 liters of solution. Calculate the pH of this solution. Report your answer with 2 places past the decimal point. Type your answer...
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Y Do you predict that this salt bridge will become stronger, become weaker, or be unaffected as pH increases from pH-7.2 to pH=7.97 The salt bridge will become stronger. The salt bridge will become weaker. The salt bridge will be unaffected. Previous Answers Correct At pH=7.2 the glutamic acid (Glu) side chain will carry a charge of -1 (at 3 pH units above the pK, for Glu, the side chain will be almost fully ionized whereas the histidine (His) side chain will carry a charge of < 0.5 (at pH pK, the charge on His would be +0.5; since pH 7.2 is above its pK, it will carry less (+) charge as it becomes more deprotonated). As the pH increase to 7.9, the charge on Glu will remain-1 and the charge on His will decrease; thus, this salt bridge is predicted to become weaker as pH is raised from 72 to 7.9. Part B Justify your answer with calculations of partial charges on these amino acid side chains at pH 7.2. (Hint: Consider lessons from Coulomb's law, and the Henderson Hasselbalch equation)…
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2. Joey was tasked to ensure that an enzyme responsible for keeping his species from extinction remains biologically active. To do so, he needs to store it in a buffer solution with a pH of 10.00. Unfortunately, only three buffer systems are available in their laboratory: Buffer System Weak Acid Component K₂ Conjugate Base Salt KYA MUH TWO A. In what buffer system (KYA, MUH, or TWO) will Joey store the enzyme? in your solution sheet, show calculations and briefly explain to support your answer. B. Write the equilibrium reaction involved in the buffer system. Write your answer on your solution sheet C. Calculate the amount (in mL) of the 1.75 M stock solution (pH 7.00) of the same buffer system needed to prepare 250 mL of a 0.550 M buffer pH 7.00. Benzoic acid, C6H5COOH 6.25 x 105 NaC6H5COO Boric acid, H3BO3 5.81 x 107 NaH₂BO3 Hydrogen cyanide, HCN 6.20 X 10-10 NaCN