20. A scientist adds 200 mL of 2.0 M NaOH to a 1.0 L buffer consisting...
A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of 1.0 M NaH2PO4. How many moles of HCI must be added to this buffer solution to change the pH by 0.40 units? Assume the total volume remains unchanged at 400 mL. For H2PO4, K = 6.3 x 10-8 0.013 mol 0.25 mol (Your answer) 0.50 mol 0.057 mol (Correct answer) 0.031 mol
A buffer is prepared by adding 300.0 mL of 2.0 M NaOH to 500.0 mL of 2.0 M CH3COOH. What is the pH of the buffer?
A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of 1.0 M NaH2PO4. How many moles of HCl must be added to this buffer solution to change the pH by 0.18 units? The answer is .025mol Please use chart if possible. Show all steps and calulations please
A student prepares a buffer by adding 200.0 mL of 2.0 M NaOH to 500.0 mL of 2.0 M CH3CH2COOH. What is the pH of this buffer? Ka = 1.3 × 10–5
a buffer solution consisting of 30ml of 1.0M HC2H3O2 + 30 ml 1.0M NaC2H3O2. 1. Write the chemical equation for buffer solution 2. Calculate ph of buffer solution and account for dilution 3. Calculate ph for buffer solution with addition of 2mL of 1.0 M HCL and account for dilution. 4. Calculate pH for buffer solution with added 2mL of 1.0 M NaOH And account for dilution. The Ka of HC2H3O2 is 1.8 x 10^-5
7. Calculate the pH of a buffer solution consisting of 2.0 g of solid KF (MMKF = 58.1 g/mol) added to 50 mL of 0.25 M HF solution given Ka (HF) = 6.31 x 104. Show your work. 8. Calculate the pH of a buffer solution consisting of 4.5 g of solid NaCOOH (MMNaCOOH = 68.1 g/mol) added to 75 mL of a 0.80 M HCOOH solution given K. (HCOOH) = 1.79 x 104. Show your work.
What mass of KF must be added to 200 mL of 0.15 M HF to obtain a buffer with pH = 3.00? Xg Enter a number. a)What is the pH of a buffer made by mixing 75 mL of 0.1 M hydrocyanic acid (HCN) with 100 mL of 0.1 M NaCN at 25 °C? 9.43 b) What is the new pH if 2 mL of 1.0 M NaOH is added to the solution in part a? X How many grams...
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...
15.00 mL of 0.100 M NaOH are added to 50.00 mL of a buffer solution containing 1.0 mmol CH3COOH and 1.0 mmol CH3COO-. What is the new solution pH? (show work) a) 11.89 b) 2.11 c) 7.87 d) can't tell/need more info.
7. Determine the volume (in mL) of a 2.0 M NaOH solution must be added to 300. mL of 0.10 M NaH2PO4 to make buffer solution with a pH of 7.30. (pKal of H2PO4 is 7.21)