Please help with this... 4. What is the pH of a 4.7 x 10-9 M HCl solution?

a. 4.67
b.- 8.33
c. 11.21
d. 2.93​

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Which element would mostly likely have an electron affinity measuring closest to zero

Ineed ! i have no clue how to do this problem.