Use the pH scale to solve the problem. Negative ions, designated by the notation [OH-] are always present in any acid or base. The concentration, [OH-], of these ions is related to [H+] by the equation [OH-] ? [H+] = 10-14 moles per liter. Find the concentrations of [OH-] and [H+] in moles per liter for the substance with the following pH value. Round to two decimal places. pH = 12.2
A. [H+] = 6.31 × 10-13
[OH-] = 1.58 × 10-2
B. [H+] = 1.58 × 10-13
[OH-] = 6.31 × 10-3
C. [H+] = 6.31 × 10-11
[OH-] = 1.58 × 10-3
D. [H+] = 1.58 × 10-2
[OH-] = 6.31 × 10-13
Answer: A
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A. 7.2687 B. -3.1568 C. -7.2687 D. 3.1568
The magnitudes src="https://sciemce.com/media/4/ppg__hgh0505191830__f1q120g6.jpg" alt="" style="vertical-align: -4.0px;" />
A. 19.1
B. 20.7
C. -36.2
D. 17.4
, 
, and the angle ? between the vectors v and w are given. Round the requested magnitude or angle to the nearest tenth.
= 14, 
= 13, ? = 80°
Find
Perform the indicated operation.48 cm - 20 mm (in centimeters)
A. 47.8 cm B. 460 cm C. 28 cm D. 46 cm
Perform the indicated operations and simplify the result. Leave the answer in factored form.
A. 
B. 
C. 
D. 