What is the pH of a solution containing 6 g of Na3PO4 per liter?
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Question 14 3 pts Which of the following pairs would be appropriate to make a buffer of PH 2.0? O HNO2 and KNO2 O NaHSO4 and H2SO4 Na2SO3 and NaHSO3 Na2HPO4 and Na3PO4 O H2C204 and NaHC204 3 pts Question 15 Which of the following pairs will make a buffer? Question 3 3 pts What is the solubility of SrF2 (s) in moles per liter (mol/L) in pure water? O 3.7 x 10-5 O 5.3 x 105 O 2.8 x...
6. (8) A 50.0 mL sample of hard water containing Ca2 was titrated with 0.0500 M EDTA standard solution at pH 10 and with Eriochrome Black T indicator. The endpoint was reached when 11.35 mL of EDTA was added a) (6) Calculate the concentration of Ca* in the unknown sample in moles per liter (M). b) (2) What is the pCa of the solution?
Which of the following has the greatest buffer capacity, that is, which could absorb the largest molar amounts of acid or base without changing pH significantly? Explain the basis of your choice. a) a mixture of 1.2 moles each of nitric acid and sodium nitrate in 2.0 L of solution. b) one Liter of 1.0 M NH_4Cl to which 2.00 moles of ammonium nitrate have been added. c) one Liter each of 0.80 M NaF and 0.80 M HF mixed...
Ammonia is a convenient buffer system in the slightly basic range. (a) What is the pH of a buffer solution containing 48 g of NH4Cl dissolved in 1.00 L of 0.865 M NH3? | pH = ............................. 4 (b) How many moles of acid are required to change the pH of this solution by 0.05 pH units? mol (c) Suppose 5.2 mL of 12.6 M HCl solution is added to 391 mL of the solution of Part (a). Calculate the...
One liter of a buffer containing 0.5 M NH3 and 0.5 M NH4+ has a pH of 9.3. If 200 mL of 1 M HNO3 is added to it, what is the new pH? 4.4 8 OOOOOO 9.6
A soln containing 439.4 g of Mg(NO3)2 (148.3 g/mol) per liter has a density of 1.114 g/mL. What is the molarity of the solution?
What is the pH of a solution of the buffer containing 0.0090 M HC5H5NCI and 0.0082 M C5H5N? The Ka of HC5H5N+ is 5.88x10-6. What is the ratio of base to acid needed to obtain a pH of 4.83 for buffer containing HC5H5NCI and C5H5N? The Ka of HC5H5N+ is 5.88x10-6. What is the pH of when 0.066 L of 0.0056 M HCN is titrated to its equivalence point with 0.057 L of NaOH? The Ka of HCN is 4.9x10-10.
A buffer contains 0.020 mol of lactic acid (pKa = 3.86) and 0.100 mol sodium lactate per liter of aqueous solution. a. Calculate the pH of this buffer. b. Calculate the pH after 8.0 mL of 1.00 M NaOH is added to 1 liter of the buffer (assume the total volume will be 1008 mL).
A 0.200 M solution of HCl is added to a solution containing 0.150 moles of sodium phosphate (Na3PO4). The resulting solution is then diluted to exactly 1.00 L, at which time the pH was found to be pH 8.00. What is the concentration of H2PO4- in the solution? For phosphoric acid, Ka1 = 7.11 x 10-3, Ka2 = 6.32 x 10-8, and Ka3 = 7.1 X 10-13.
What is the pH of a 25°C solution containing 10-3 moles NaHCO3 and 2×10-3 moles of NH3 per liter of seawater? Assume that the dissolved solids concentration for seawater is 35,000 mg/L. Assume closed system.