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Question 14 3 pts Which of the following pairs would be appropriate to make a buffer...
What is the solubility of SrF2 (s) in moles per liter (mol/L) in pure water? O 5.3 x 10-5 O 8.9 x 10-4 O 7.0 x 10-10 O 3.7x 105 2.8 x 10 3 pts Question 4 What is the solubility in moles per liter (mol/L) of SrF2 (s) from the previous problem in a.2 M Sr2 (aq) solution? O 5.9 x 10 O 1.2 x 10+ O 7.0 x 10° O 1.4 x 10 O 8.4 x 105
just #4 What is the solubility of SrF2 (s) in moles per liter (mol/L) in pure water? O 5.3 x 10-5 8.9 x 10-4 O 7.0 x 10-10 O 3.7 x 10-5 O 2.8 x 10-9 D Question 4 3 pts What is the solubility in moles per liter (mol/L) of SrF2 (s) from the previous problem in a.2 M Sr2(aq) solution? O 5.9 x 10-5 O 1.2 x 10-4 7.0 x 10 O 1.4 x 10-8 O 8.4 x...
You are instructed to create 400. mL of a 0.39 M phosphate buffer with a pH of 6.2. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) = H30+ (aq) + H2P04 (aq) Kai = 6.9 x 10-3 H2PO4 (aq) + H20(1) =H30+ (aq) + HPO42-(aq) Ka2 = 6.2 x 10-8 HPO42-(aq) + H20(I) = H30+(aq) + PO43-(aq) Ka3 = 4.8 x 10-13 Which of...
Question 6 5 pts Which buffer system is the best choice to make a buffer at pH 3.15? HC,H502/C7H502 O HNO2/HNO2 HCIO/CIO HC2H302/C2H302 HOCI/OCI- HNO/NO,
Which of the following pairs will make a buffer? 1. HCIO4 and NaClO4 4. NH3 and NH_Br 2. NaClO and NaClO2 5. NaHSO3 and H2SO3 3. HCHO2 and NaCHO2 o 1 and 2 only O 3,4, and 5 only O 1,3,4, and 5 only O 1,2, and 5 only o 3 and 4 only
Buffers 1. Indicate which of the following pairs of compounds could be used to make a buffer solution by placing an X in the appropriate column. Buffer Solution | Not a Buffer Solution Pair of Compounds HF and Cl H.COs and OH HNO2 and NO NHa and NH L 2. Write out the reaction of acetic acid CH.COOH reacting with water. 3. What is the pH of a buffer solution in which the (CH3COOH) is 0.229 M and the (CH...
1 A) Which of the following pairs of solutions when mixed will form a buffer solution? Group of answer choices H2SO4 and Ca(OH)2 NH3 and NH4Br NaNO3 and HNO3 KOH and KNO2 B)Phosphoric acid, H3PO4, is a triprotic acid with the following Ka values: Ka1 = 7.5 x 10-3; Ka2 = 6.2 x 10-8; Ka3 = 3.6 x 10-13 In a solution of 0.15 M H3PO4, which species will be most abundant? H3O+ H3PO4 HPO42- H2PO4-
1. Indicate if the following pairs would form a buffer: a. HBr and KBr: Yes or No b. HCHO and KCHO: Yes or No c. NH CI and NH: Yes or No d. NaOH and NaCl: Yes or No 2. Calculate the pH of a solution that is 0.250 M HCHO, and 0.342 M NaCHO, K = 4.0 x 10 3. Which of the following would be best to prepare a buffer solution with a pH of 1.25? a. HCHỊ0,...
QUESTION 11 Which of the following acid/base conjugate pairs could you use to make a buffer solution with a pH of 2.10? The Kfor the acids are given in parentheses. Chlorous acid / chlorite (Ka = 1.1 10-2) Benzoic acid / benzoate (K, -6.3 * 10-5) O Hydrofluoric acid / fluoride (Ka = 6.6 x 10-4) Hydrogen phosphate / phosphate (Kg = 4.2 x 10-13) Ammonium / ammonia (K, -5.8 * 10-10)
Question 7 0.77 pts Title q7a7 Which of the following pairs of species, when mixed together in water in proper ratios, would provide a buffer solution? Think each pair through very carefully in terms what species will form when they dissolve in water, and how they can then (potentially) react with water Refer to the table of strong acids/bases on the exam information sheet if you don't have them memorized yet. () KOH and NH4CI (ii)HCI and NH4CI (liI) NH3...