QUESTION 7 4 points 574 mL 0.0300 MHCI added, measured using a buret Final pH 4.

Question

QUESTION 7 4 points 574 mL 0.0300 MHCI added, measured using a buret Final pH 4.24 Caoulate the moles of HC added to the buffer. (Answerin decimal fommat with 3significant fgures and units of moln Caloulate the acid buffer capacity of the bufer using moles of HC per liter of bufet. Answerin decimalformat with3signifoartfigures and units of molt) QUESTION B 250 mL of aortic acid-acetate buffer, measured with a pipet Initial pH 457 2 65 ml of 0.0300 M NaOH added measured using a buret Final pH 524 Caouate moles of NaoH added no the butner. (Answerin decimal somat wth 3 sgnscant figures and units of moll calculate the base butter capacity the bufor using of NaoH periaer orbiner. Answer in decimafonmat with 3 sovfoantfigures anduntsofm QUESTION 9 neutralae more aod or more base? oalculated for stu and Dor's buffrinthe previous two questons ingeneral.wilterbenerbeab Mone base because the base capacity is greater. More acid because acid capaoty is greater D F G H J K L

Explanation / Answer

Moles of HCl added = Molarity of HCl * volume of HCl added in L = 0.03 M * 0.00574 L = 1.722*10^-4 moles

change in pH = 4.57-4.24 = 0.33

buffer capacity = moles of acid added/ change in pH = 1.722*10^-4/0.33 = 0.0005

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