What is the ka for 0.03M Solution of HClO4 for 1.90 PH value. A) 7.2x10^-3
B) 8.27x10^-3
C) 8.27x10^-4
D) 6.27x10^-4

(I keep getting 5x10^-3 when I round all the values to 2 decimal places but it’s not in the options)

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

im not exactly sure but i think its b!