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Calculate the volume (in mL) of 0.170 M NaOH that must be added to 341 mL...

Calculate the volume (in mL) of 0.170 M NaOH that must be added to 341 mL of 0.0555 M 3-(N-Morpholino)propanesulfonic acid (MOPS) to give the solution a pH of 7.55. The pKa of MOPS = 7.18.

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Expert Solution

MOPS millimoles = 341 x 0.0555 = 18.93

NaOH millimoles = 0.170 x V

MOPS   +     NaOH ---------------------> salt

18.93          0.170V                              0 -------------------> initila

18.93-0.170 V      0                                 0.170 V --------------> equilibrium

it is buffer so

pH = pKa + log [salt /acid]

7.55 = 7.18 + log [0.170 V / 18.93 -0.170V]

0.37 = log [0.170 V / 18.93 -0.170V]

0.170 V / 18.93 -0.170V = 2.344

0.170 V = 44.376 - 0.3985 V

V = 78.1 ml

volume of NaOH = 78.1 ml

queen_honey_blossom answered 1 hour ago
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