Sharp EL-W535TG - Polynomial Equation Solving; Quadratic Equation for pH

53
<Example 1>
Let the hydrochloric acid concentration be c (= 1.0 x 10
-8
mol / ), and the
hydrogen ion concentration be x.
(1)
Solve the following quadratic equation to find the hydrogen ion concentration x:
x
2
- cx - K
w
= 0
where
K
w
= 1.0 x 10
-14
[mol / ] (ionic product of water)
(2) Use the result of (1) to find the pH (= - log x) of hydrochloric acid.
Save constants
(1)
pH = - log x (x>0)
1.0 14
(NORMAL)
Operation
1.0 8
B
C
Polynomial equation
Display
(This example is for EL-W516T only.)