Strong base is dissolved in 625 mL of 0.400 M weak acid (Ka 4.48 x10) to make a buffer with a pH of 4.08. Assume that the volume remains constant when the base is added Calculate the pKa value of the acid and determine the number of moles of acid initially present. ncorrect. Use the volume and concentration in the question to find moles. Number Number pK,434 2.5 mol HA Molarity is the number of moles per liter When the reaction is complete, what is the concentration ratio of conjugate base to acid? Number НА How many moles of strong base were initially added? Number mol OH

Question

How do I set up the equation to figure out the concentrations of HA and OH-?

Strong base is dissolved in 625 mL of 0.400 M weak acid (Ka 4.48 x10) to make a buffer with a pH of 4.08.
Assume that the volume remains constant when the base is added
Calculate the pKa value of the acid and determine the number of moles of acid initially present.
ncorrect.
Use the volume and concentration
in the question to find moles.
Number
Number
pK,434
2.5
mol HA Molarity is the number of moles
per liter
When the reaction is complete, what is the concentration ratio of conjugate base to acid?
Number
НА
How many moles of strong base were initially added?
Number
mol OH
Expand
Transcribed Image Text

Strong base is dissolved in 625 mL of 0.400 M weak acid (Ka 4.48 x10) to make a buffer with a pH of 4.08. Assume that the volume remains constant when the base is added Calculate the pKa value of the acid and determine the number of moles of acid initially present. ncorrect. Use the volume and concentration in the question to find moles. Number Number pK,434 2.5 mol HA Molarity is the number of moles per liter When the reaction is complete, what is the concentration ratio of conjugate base to acid? Number НА How many moles of strong base were initially added? Number mol OH

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