Quiz on unit 8 must knows

#1 Which of the following terms matches the definition?

14 always!!

pH + pOH = strong acid-weak base reaction how to increase/decrease buffering capacity H2O pH is always...

#2 Which of the following terms matches the definition?

if weak base is in excess --> a buffer --> Hendeson Hasselbalch equaiton if strong acid is in excess, the moles of excess acid are used to determine pH if acid and base are equimolar then the equilibrium concentrations are used to determine pH

weak acid-strong base reaction Kw = strong acid-weak base reaction equivalence point

#3 Which of the following terms matches the definition?

increasing/decreasing concentrations of buffer components, but keeping the ratios constant (if you don't it'll change the buffer capacity for either acid or base respectively)

how do you calculate a buffer's pH how to increase/decrease buffering capacity in what range are buffers effective pH + pOH =

#4 Which of the following terms matches the definition?

HA(aq) + OH- --> A-(aq) + H2O(L) if weak acid is in excess --> a buffer --> Hendeson Hasselbalch equaiton if strong base is in excess, the moles of excess hydroxide ions is used for pH if acid and base are equimolar then the equilibrium concentr

how do you calculate a buffer's pH weak acid-strong base reaction weak acid-strong base reaction in what range are buffers effective

#5 Which of the following definitions matches the term?

maximum buffering capacity

pH = 7 @ 25 C / 298 K pH = pKa pH = pKa straight line up part of graph #miles of titrant = #moles of analyte concentration and volume of titrant is then used to determine concentration of analyte

#6 Determine if the following combination is true or false.

strong acid strong base equivalence point

pH = 7 @ 25 C / 298 K

True

False

#7 Determine if the following combination is true or false.

how do you calculate a buffer's pH

pH = pKa + log [A-]/[HA] ---> acids pOH = pKb + log [BH+]/[B] ---> bases the conjugate salt is on top, and the bottom is either the base or the acid assume there is a limiting and excess reagent (because it will contain either a strong acid or base)

True

False

#8 Determine if the following combination is true or false.

in what range are buffers effective

1.0 x 10^-14 at 25 C or 298 K

True

False

#9 Determine if the following combination is true or false.

what is a buffer

solution that is resistant to a small pH change, it has to contain a weak acid or base pared with its conjugate salt(Na+, H3O-, etc...) and it creates neutral compounds, keeping pH relatively stable

True

False

#10 Determine if the following combination is true or false.

H2O pH is always...

straight line up part of graph #miles of titrant = #moles of analyte concentration and volume of titrant is then used to determine concentration of analyte

True

False

Section 1: Multiple Choice questions

14 always!!

if weak base is in excess --> a buffer --> Hendeson Hasselbalch equaiton if strong acid is in excess, the moles of excess acid are used to determine pH if acid and base are equimolar then the equilibrium concentrations are used to determine pH

increasing/decreasing concentrations of buffer components, but keeping the ratios constant (if you don't it'll change the buffer capacity for either acid or base respectively)

HA(aq) + OH- --> A-(aq) + H2O(L) if weak acid is in excess --> a buffer --> Hendeson Hasselbalch equaiton if strong base is in excess, the moles of excess hydroxide ions is used for pH if acid and base are equimolar then the equilibrium concentr

maximum buffering capacity

Section 2: True/false questions

strong acid strong base equivalence point

pH = 7 @ 25 C / 298 K

how do you calculate a buffer's pH

pH = pKa + log [A-]/[HA] ---> acids pOH = pKb + log [BH+]/[B] ---> bases the conjugate salt is on top, and the bottom is either the base or the acid assume there is a limiting and excess reagent (because it will contain either a strong acid or base)

in what range are buffers effective

1.0 x 10^-14 at 25 C or 298 K

what is a buffer

solution that is resistant to a small pH change, it has to contain a weak acid or base pared with its conjugate salt(Na+, H3O-, etc...) and it creates neutral compounds, keeping pH relatively stable

H2O pH is always...

straight line up part of graph #miles of titrant = #moles of analyte concentration and volume of titrant is then used to determine concentration of analyte

Triple-checked your answers?

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