Answer:
1.9
Step-by-step explanation:
Let us call to mind the formula
m/M= CV
Where
m= mass of the solute= 5.41 g
M= molar mass of the solute = 63.02g
C= concentration of the solution (the unknown)
V= volume of the solution = 7L
5.41 / 63.02g = 7C
0.0858= 7C
C= 0.0858/7
C= 0.01226 molL-1
[H^+]= [HNO3]= 0.01226 molL-1
pH= - log [H^+]
pH= -log(0.01226)
pH= 1.9