Question about Texas Instruments TI-30XA Calculator
The pH is defined as the negative log in base 10 of the H+ (H3O+) ion concentration. The concentration of your solution is 1.2x10^(-5). You calculate the log of 1.2x10^(-5) which is -4.9208188754, let us just say it is equal to -4.921.
Once result is displayed press the change sign key (-) or on some calculators [+/-] and calculator will take the negative of the result.
So your pH is about 4.921
Another less efficient way to do it is to enter
0-log(1.2x10^-5) [ENTER]. The result will be positive.
The change sign (-) is smaller than the regular MINUS sign. It is used with negative exponents and to change the sign (hence its name) of a displayed result.
Posted on Oct 06, 2009
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Posted on Jan 02, 2017
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