How many mL of 0.90 M HCl must be added to 250 mL of 0.280 F sodium formate in order to adjust the pH to 3.50? Formic acid Ka = 1.8x10^-4
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How many mL of a 4.00 M HCl solution must be added to 250 mL of a 0.250 M NH3 solution to make a buffer with pH = 9.10? Look up Ka or Kb in a suitable source.
What mass of sodium formate must be added to 550.0 mL of 1.30 M formic acid to produce a buffer solution that has a pH of 3.40 (Ka [HCOOH]) =1.80 x 10 ^-4)?
A buffer made with 150.00 mL of 0.20 M formic acid (Ka=1.8x10-4) and 250.00 mL of 0.10 M formate has a final volume of 1.0 L. What is the pH after 6.00 mL of 1.0 M HCL is added to the buffer?
What volume, in mL, of 2.00 M HCl must be added to 1.00 L of a 0.100 M solution of sodium formate, Na+HCOO-, to produce a buffer solution having a pH = 4.00? (Ka HCOOH = 1.9 x 10-4) A. 17 B. 1.9 C. 34 D. 30 E. 3.5
What mass of sodium hydroxide must be added to 75.0 mL of 0.205 M acetic acid in order to create a buffer with a pH of 4.74? acetic acid Ka=1.8x10^-5 (Answer is 0.31g how do we arrive there?)
3. (5 pts) Find mass of sodium formate to be added to 25.0 mL of 0.25 M solution of formic acid so that after dilution to 100.0 mL the resulting solution has pH = 4.0. The acid dissociation constant of formic acid is 1.8x10".
how many grams of sodium formate must be dissolved in a 0.300 M solution of formic acid to make 400.0 ml of a buffer solution with a pH=4.60?
2. A Student wants to prepare 250.0 mL of pH 4.1 buffer solution. He is planning to use formic acid (HCOOH) and sodium formate (HCOONa) for this job. What should the mass of sodium formate that he should add to 250,0 mL of 0.20 M formic acid solution to prepare this buffer? (K =1.8x10 for formic acid.) 3. If 0.10 M solution of a weak acid has a pH of 3.90, find the Ka for the acid.
How many moles of sodium hydroxide would have to be added to 250 mL of a 0.422 M hypochlorous acid solution, in order to prepare a buffer with a pH of 7.360? moles
How many mL of 3.50 M potassium hydroxide must be added to 500 mL of a 0.200 M carbonic acid solution to make a buffer with pH = 6.30? (Assume only the first hydrogen is dissociated.)