The final volume of buffer solution must be 100.00 mL and the final concentration of the weak acid must be 0.100 M. Based on this information, what mass of solid conjugate base should the student weigh out to make the buffer solution with a pH of 1.00

0.387 g

Explanation:

pH of the buffer = 1

V = Volume of solution = 100 mL

[HA] = Molarity of HA = 0.1 M

= Acid dissociation constant =

(assuming base as )

Molar mass of base = 322.2 g/mol

pKa is given by

From the Henderson-Hasselbalch equation we get

Moles of base

Mass of base is given by

The required mass of the base is 0.387 g.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current