Answer:
Flow rate from buret Y is 2.061 ml/min
Flow rate from buret Z is 4.204 ml/min
Step-by-step explanation:
The equation for the reactions are
NaOH + HCl → NaCl + H₂O
KOH + HCl → KCl + H₂O
Total volume of Y and Z = Final volume in buret - initial volume in buret
= 655 - 275 = 380 ml
Therefore we have
275 ml · 0.3 M HCl = V ·0.150MOH + (380 - V)0.25·MOH
Which gives
82.5 = 0.150V +95 -0.25V
From which V = 0.125 ml
Therefore 125 ml of NaOH was added in 60.65 minutes from buret Y with flow rate given by
125/60.65 = 2.061 ml/min
Also 380 - 125 or 255 ml of KOH was added in 60.65 minutes from buret Z with flow rate given by
255/60.65 = 4.204 ml/min.