acid-base solutions and pH (PhET).pdf - Acid-Base Solutions and pH PhET simulation

acid-base solutions and pH (PhET).pdf - Acid-Base Solutions...

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Acid-Base Solutions and pH PhET simulation *Write answers and notes on your own paper Part A. Visualizing acid strength, concentration, and pH 1. Click on “Introduction”. For each solution, write down the following: Solution chemical equation at equilibrium concentration of ions (see Graph) pH reading Water 2 H 2 O H 3 O + + OH - H 3 O+ = 1.00 x 10 -7 M OH- = 1.00 x 10 -7 M 7.00 Strong acid Weak acid Strong base Weak base 2. Write down formulas for calculating pH and pOH: pH = - log [H+] pH + pOH = 14 Example (write this down!): For the pH of a solution with a hydrogen ion concentration of 1 x 10 -7 M, on your calculator, hit these keys in order: “1” → “EXP” → “-7” → “log” → “-“ (minus sign) = 7 therefore, pH of 1 x 10 -7 M = - log 1 x 10 -7 = 7 To find pOH, pOH = 14 - pH = 14 -7 = 7 therefore, pOH of solution at pH 7 = 7
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3. Calculate the following pH and pOH values Solution # [H+] or [H 3 O+] pH pOH 1 1 x 10 -3 M 2 1 x 10 -5 M 3 1 x 10 -8 M 4 1 x 10 -11 M 5 1 x 10 -13 M 4.
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