11:39Buffer solution pH calculations | Chemistry | Khan AcademyKhan Academy Organic Chemistry1008views
Multiple ChoiceWhich one of the following combinations does not create a buffer?1513views3rank11comments
Multiple ChoiceWhich of the following combinations can result in the formation of a buffer?1647views5rank7comments
Multiple Choice Which of the following combinations can result in the formation of a buffer?1644views5comments
Multiple ChoiceA buffer solution is comprised of 50.0 mL of a 0.100 M HC2H3O2 and 60.0 mL of a 0.100 M NaC2H3O2. Which of the following actions would completely destroy the buffer?2193views3rank9comments
Multiple ChoiceCalculate the pH of a solution formed by mixing 200 mL of a 0.400 M C2H5NH2 solution with 350 mL of a 0.450 M C2H5NH3+ solution. (Kb of C2H5NH2 is 5.6 x 10 -4).2626views2rank19comments
Multiple ChoiceDetermine how many grams of sodium acetate, NaCH3CO2 (MW:82.05 g/mol), you would mix into enough 0.065 M acetic acid CH3CO2H (MW:60.05 g/mol) to prepare 3.2 L of a buffer with a pH of 4.58. The Ka is 1.8 x 10-5.2936views9comments
Multiple ChoiceA buffer solution is made by combining a weak acid with its conjugate salt. What will happen to the pH if the solution is diluted to one-fourth of its original concentration?2281views2comments
Multiple ChoiceWhich of the following statements is true about a solution prepared with equal amounts of HNO2 and NaNO2?365views
Multiple ChoiceThe addition of which of the following would destroy a 1.0 L buffer that is 0.50 M HC2H3O2 and 0.40 M NaC2H3O2?337views
Multiple ChoiceWhat is the pH of a 1.0 L buffer solution containing 0.500 M HF and 0.300 M NaF. Ka for HF = 3.5 × 10−4.440views
Multiple ChoiceDetermine the pH of a 1.0 L buffer prepared by adding 0.100 moles of NaOH to 0.250 moles of HF. Ka for HF = 3.5 × 10−4.329views
Multiple ChoiceWhat mass of NaC2H3O2 (molar mass = 82.03 g/mol) would need to be added to 0.450 moles of HC2H3O2 to prepare a 1.0 L buffer with a pH = 4.95. Ka for HC2H3O2 = 1.8 × 10−5.1154views
Multiple Choice1.0 L of a buffer is prepared to produce a solution that is 0.400 M in HF and 0.250 M in LiF. What is the pH after the addition of 2.5 g of KOH? Assume no volume change. Ka for HF = 3.5 × 10−4.397views
Multiple ChoiceWhich pairs of compounds are capable of making a buffer? Select all that apply.a) 1.3 M LiOH and 1.7 M HCOOH c) 0.35 M CH3CO2H and 0.35 M NaOHb) 0.784 M NH4+ and 0.800 M HClO4 d) 0.80 HNO3 and 0.15 MgO454views8rank1comments
Multiple ChoiceDetermine which of the following actions will destroy a buffer composed of 0.50 L of 1.44 M H3PO4 and 0.60 L of 1.25 M NaH2PO4−.a) Addition of 1.45 moles of KH2PO4b) Addition of 0.85 moles of HClc) Addition of waterd) Addition of 0.30 moles of Ca(OH)2e) Addition of 0.70 moles of HIO4452views9rank
Open QuestionA buffer resists change in ph when ___________ amount of acid or base is added to it.215views
Open QuestionA solution that resists a change in ph when an acid or base is added to it is a(n) __________.215views
Open QuestionA(n) is a substance or a mixture of substances that act to resist changes in pH.189views
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