what is the ratio [HClO2]:[NAClO2] should you use to get a buffer at pH of 1.50?
what is the ratio [HClO2]:[NAClO2] should you use to get a buffer at pH of 1.50?
If 0.81g of NaClO2 is added to 150 mL of 0.11M HClO2, what is the pH of the buffer? ( Write answer to the hundredths place) KA(HClO2) = 1.1x10-2
Consider a buffer that is 0.550 M in HClO2 and 0.450 M in NaClO2, if you add 75.0 mL of 1.00 M HCl to 250.0 mL of this buffer solution, will it still be considered a buffer solution? Explain your reasoning. (The question was posed like this without the Ka value of HClO2, and the students are expected to solve the problem without it.)
Which of the following combinations would make a buffer with pH close to 3.0? HClO2 Ka = 1.1 × 10-2 NH3 Kb = 1.8 × 10-5 HNO2 Ka = 7.2 × 10-4 C5H5N Kb = 1.5 × 10-9 Equal volumes of 0.10 M NH4Cl and 0.10 M NH3 Equal volumes of 0.10 M HClO2 and 0.10 M NaClO2 Equal volumes of 0.10 M HNO2 and 0.10 M NaNO2 Equal volumes of 0.10 M HCl and 0.10 M NaCl Equal volumes...
5. You need to make 500.0 mL of a buffer with a pH of 2.20. You have the following substances to work with: 0.100 M NH3 Solid NaN3 Solid NaClO2 0.100 M HClO2 Solid NH4Cl Solid Na2SO3 0.100 M HN3 Solid NaHSO3 Ka for HClO2 = 1.1x10-2 Kb for NH3 = 1.8x10-5 Ka for HN3 = 1.9x10-5 Ka1 for H2SO3 = 1.7x10-2 Ka2 for H2SO3 = 6.4x10-8 (Assume that the addition of solid does not change the volume of the...
Find the pH of a 0.190 M HClO2(aq) solution. For HClO2, Ka=0.011. What mass of sodium benzoate should be added to 150.0 mL of a 0.16 M benzoic acid solution in order to obtain a buffer with a pH of 4.30?
4. You want to prepare a buffer with a pH of 9.00. You decide to use NH3 and NH4CI, which has a pK2=9.25. a. What ratio of [NH3]/[NH4Cl] is required to make this buffer? (5 points) b. If the concentration of NH4Cl is 0.10M, what should the concentration of NH3 be? (3 points)
20. A scientist adds 200 mL of 2.0 M NaOH to a 1.0 L buffer consisting of 1.0 M HClO2 and 1.20 M NaClO2. What is the pH of the resultant solution at 25'C? (K, of HClO2 = 1.1 x 10-2) A. 2.0 B. 1.2 C. 3.5 D. 2.4 E. 1.4
You are asked to prepare a pH=4.00 buffer starting from 1.50 L of 0.0200M solution of benzoic acid (C6H5COOH) and an excess of sodium benzoate (C6H5COONa). How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when the sodium benzoate is added.
Which of the following acids should be used to prepare a buffer with a pH of 5.9? HOCH2COOH, Ka = 3.5 × 10–4 HClO2, Ka = 1.1 × 10–2 HBrO, Ka = 2.3 × 10–9 ClCH2COOH, Ka = 1.4 × 10–3 C6H13NO4S, Ka = 7.08 x 10-7
4. You want to prepare a buffer with a pH of 9.00. You decide to use NH3 and NH4CI, which has a pK-9.25. ( oase What ratio of [NH,)/[NH4ČI] is required to make this buffer? (5 points) a. PH-PKa tlog fA pLD-4.75 00