Question

Solve for x.

4.3 = - log [x]

I need to solve pH problem but forgot how to solve logs. So please explain step by step.

Please type, no handwriting.

Answer 1

According to the eq

4.3 = - log(x)

x= antilog(-4.3)

1. For calculating antilog , it having 2 parts one is characteristic that comes before decimal point & mantissa that comes after the decimal point. Here the characteristic is- 4 & mantissa is 3.

2. For -4.3 add +5 & -5.

= -4.3+ 5 - 5 = -5+(5- 4.3)= -5+0.7. use the antilog table find the actual digit of 0.7. it is 5012.

here the base is always 10.

so 5012 is multiplied with 10^-5

x = 5012 x 10-5