14 (1 Point) What is the [H,0*) at the transition point for an indicator with a...
12 (1 Point) Consider the following equilibrium for an acid-base indicator: Hind H+ + Ind K = 1.0 x 10-10 Which of the following statements is correct at pH 7.0 ? A. [Ind"] <[HInd] B. [Ind'] = [HInd] C. [Ind] > [HInd] D. [Ind] = [HInd] = [HT] E. KA = [H*] A B Ос OD E
18 * (1 Point) An indicator changes colour in the pH range of 6.40 - 7.20. What is the K, for this indicator? a) 4.0 x 107 b) 1.6 x 10-7 c) 0.80 d) 6.80 A 0 Ос OD
20 & 21
What is the concentration of the hydronium ions in an acidic solution? 1.0 x 10-14M 1.0 x 10'M O > 1.0 x 10-7M 0 <1.0 x 10M O 00M Question 21 1 pts What is the concentration of Hyo'lons in a solution given that the concentration of hydroxide ions is 2.31 x 104 M? 2.31 x 1010M 4.33 x 10-11M 2.31x 10-18 1.01% 10 M
5 (1 Point) Consider the following equilibrium for an indicator: Hind + H2OH,0* + Indº Which two species must be of two different colours in order to be used as an indicator? A. Hind and H2O B. Hind and Ind C. H,O* and Ind D. Hind and H,0* E. H2O and Ind ОА НОВ с Ο Ε
1.) What is the concentration of a solution of PCR primers if the absorption of 260 nm (A260) is 0.478 the path length is 1.0 cm and the extinction coefficient (absorptivity) is 185 mM^-1 cm ? a. 0.39 mN b. 3.9 x 10^-3 M c. 2.6 x 10^-3 mmol/L d. 2.6 mmol/L 2.) What is the concentration of a stock solution of PCR primers if the absorption of a diluted solution at 260 nm (A260) is 0.528, the path length...
27 (1 Point) A sample of an unknown solution is tested with the indicator chlorophenol red. The solution turns yellow on the addition of this indicator. The solution could be ... A. 1.0 MKF B. 1.0 M NaCl C. 1.0 M Li,SO, D. 1.0 M CaBr E. 1.0 M NH NO A B Сс D E
Question 11 (1 point) The pH of a aqueous solution is measured to be 10.0; what is the concentration of hydroxide fons (OH') in this solution at 298K - assuming Kw - 1x10-147 O 1x 10-10 M O 1.0 x 10-7M O 1 x 1010 M O 1.0 x 10-14 M 1.0 x 10-4 M
11 ** (1 Point) A new indicator, "B.C.Blue (Hind)", is red in bases and blue in acids. Describe the shift in equilibrium and the resulting colour change if 1.0 M HIO, is added to a neutral, purple solution of this indicator Hind + H2O = H,0* + Ind A. Equilibrium shifts left, colour becomes red. B. Equilibrium shifts left, colour becomes blue, C. Equilibrium shifts right, colour becomes red. D. Equilibrium shifts right, colour becomes blue. E. Equilibrium does not...
calculate equilibrium dissiociation constant of water
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We know that Kw = 1.0 x 10-14 at 25°C. At 37°C, the [H3O+] in pure water is 1.6 x 10"| M. Calculate the equilibrium dissociation constant of water, Kw, at this temperature. A. 2.6 x 10-14 | CNH-TT H+7: 10 x 10-14 DH = -log(11 B. 1.0 x 10-7 C. 1.0 x 10-14 [1-6x10-?][6.16 *10-8] PH= 6.79 D. 1.6 x 10-7 POH=7. 21
4. Identify the conjugate acid of S042 A) H:SO4 B) HSQF C) H3SO3 D) H3O+ E) SO32- 5.The OH- concentration in a 7.5 x 10-3 M Ca(OH)2 solution is A) 75 x 10-3M D) 1.0 x 10-?M B) 1.5 x 10-2M. E) 1.0 x 10-14 M. C) 13 x 10-12 M 6. What is the H+ ion concentration in a 4.8 x 10-2M KOH solution? A) 4.8 x 10-2 M D) 4.8 x 10-12 M B) 1.0 x 10-7M E)...