Complete the following table (All solutions are at 25 degree C) Complete the fir
ID: 997197 • Letter: C
Question
Complete the following table (All solutions are at 25 degree C) Complete the first column. Express your answers using two significant figures. Enter your answers numerically separated by commas. Complete the second column. Express your answers using two significant figures. Enter your answers numerically separated by commas. Complete the third column. Express your answers using two significant figures. Enter your answers numerically separated by commas. Complete the fourth column. Enter your answers separated by commas.Explanation / Answer
the information required is
[H30+] [OH-] = 10-14
pH = -log [H30+]
also
if pH < 7 , acidic
if pH > 7 , basic
now
1) [H30+] = 3.5 x 10-3
[H30+] [OH-] = 10-14
3.5 x 10-3 x [OH-] = 10-14
[OH-] = 2.857 x 10-12
now
pH = -log [H30+]
pH = -log 3.5 x 10-3
pH = 2.456
pH < 7 so it is acidic
2)
[OH-] = 3.8 x 10-7
so
[H30+] x 3.8 x 10-7 = 10-14
[H30+] = 2.63 x 10-8
now
pH = -log [H30+]
pH= -log 2.63 x 10-8
pH = 7.58
now
pH > 7 , so basic
3)
[H30+] = 1.8 x 10-9
[H30+] [OH-] = 10-14
1.8 x 10-9 x [OH-] = 10-14
[OH-] = 5.555 x 10-6
now
pH = -log [H30+]
pH = -log 1.8 x 10-9
pH = 8.7447
pH > 7 so it is basic
4)
pH > 7 , so it is basic
now
pH = -log [H30+]
7.15= -log [H30+]
[H30+] = 7.08 x 10-8
now
[H30+] [OH-] = 10-14
7.08 x 10-8 x [OH-] = 10-14
[OH-] = 1.4125 x 10-7
finally
[H30+] [OH-] pH acidic or basic
3.5 x 10-3 2.857 x 10-12 2.456 acidic
2.63 x 10-8 3.8 x 10-7 7.58 basic
1.8 x 10-9 5.55 x 10-6 8.7447 basic
7.08 x 10-8 1.4125 x 10-7 7.15 basic