1 Indicate whether the pH of each solution described below would be greater or less than 7. a. Has a low concentration of H₂O.. b. Contains a weak acid dissolved in water. c. Contains a strong base dissolved in water. d. Has a low concentration of OH-. e. [H3O+] 9.88 x 102 M.
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- I want clear handwritten solution only....i will up vote18.Which of the following is true? A. When acid is added to pure water, kw, the ion-product constant of water, changes. B. The equilibrium constant of water (keq) is the rate that dissociation of the molecule occurs at room temperature C. The H* (or H³O*) in cells is the same concentration as that of undissociated water D. None of the above E. All of the above1. What is the molality of the following solutions? a. 171.9 g of Sr(NO3)2 is dissolved in 1.44 kg of water. b. 0.883 g of K3PO4 is dissolved in 40.0 g of water. 0.250M=0.250mcl kF IL scl i80.anilio (6250 mcl 0.500M=0.500md wO IL Som
- 1. Adding as little as 0.1 ml of concentrated HCl to a liter of H20 shifts the pH from 7.0 to 3.0. Adding the same amount of HCl to a liter of a solution that 0.1 M in acetic acid and 0.1 M in sodium acetate, however, results in a negligible change in pH. Why do these two solutions respond so differently to the addition of HCI?3. A buffer was prepared by dissolving 15 grams if ammonium chloride in 100mL solution prepared by diluting 15mL of concentrated ammonia [28% by mass with a density of 1.00 g/mL] to make 100mL solution of dilute ammonia. a. What is the pH of the buffer solution? b. What will be the change in pH if 10mL of 0.005M HCl is added to 25mL of this buffer solution? c. What will be the change in pH if 10mL of 0.005M NaOH is added to 25mL of this buffer?1. Calculate the pH of a buffer solution made from 0.20 M CH3COOH and 0.50 M CH3COO- that has an acid dissociation constant for CH3COOH of 1.8 x 10-5.
- Based on the Henderson-Hasselbalch equation (shown below), calculate the pH when half of a solution of acetic acid is dissociated to acetate (the pKa of acetic acid is 4.76). A. 1.00 B. 3.76 C. 4.76 D. 5.762. A. If 100 mls of 0.03 M HCI is added to 400 mls of 0.5 M glycine buffer at pH 10.4, what is the resultant pH? (pK1 for Gly= 2.2, Pk2=9.4) Gly.4L X.5mol/L= .2 mol HCI.1LX.03mol/L = .003mol Glyº .02mol +.003 mol .023mol [HA] = .023/.5L =.046M, [A-] =.177/.5L = .354M pH = pka +log [A-]/[HA] pH = 9.4 +log.354/.046 = 10.3 [HCI] = [H+] = .003mol/.5L = .006M pH =2.2 Gly + H+ .18mol -.003mol .177mol end start B. What would the pH be if the same amount of HCl as in part A was added to 400 mls of water?1.8
- What is the concentration in % (w/v) of a solution prepared from 50.0 g NaCl and 2.5 L of water? A. 5.0 % B. 2.0 % O C. 0.020 % D. 0.050 % E. 0.50 %What is the pH when 50 ml 0.1 M NaOH is added to 100 ml 0.2 M HA? (K3= 10 Lütfen birini seçin: a. 7.6 O b. 4.5 O c. 6 d. 8.5 O e. 5.53) Ammonia, NH3, is toxic to a wide range of aquatic organisms including snails, insects, and fish. The ammonium ion, NH4", is much less toxic since the cation does not diffuse rapidly across cell membranes. The US EPA limit for total ammonia in natural waters is 1.9 mg/L at pH 7. a. What is this limit in molar units? b. What is the concentration of NH3 at pH 7? c. What is the concentration of NH3 at pH 6? d. Why is the EPA limit for total ammonia dependent on the water pH?