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PH. There is a formula to find pH pH = -log [H + ] or pH = -log [H 3 O + ] – (brackets around a substance means that substances concentration in molarity)

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Presentation on theme: "PH. There is a formula to find pH pH = -log [H + ] or pH = -log [H 3 O + ] – (brackets around a substance means that substances concentration in molarity)"— Presentation transcript:

1 pH

2 There is a formula to find pH pH = -log [H + ] or pH = -log [H 3 O + ] – (brackets around a substance means that substances concentration in molarity) To find the pH you need to H + concentration Most of the time you will get an acids concentration

3 Finding the [H + ] To find [H+] you need to multiply the concentration of the acid by how many hydrogens are in the formula. So, if you have a M HCl solution, what is [H + ]? If you have a M H 2 SO 4 solution, what is [H 3 O + ]?

4 pH If you have a [H + ] of 1x10 -6, use the formula to find the pH? Remember the formula is pH = -log [H + ] or pH = -log [H 3 O + ] It has a pH of 6

5 pH If [H + ] = 1x10 -n, then pH = n If pH = n, then [H + ] = 1x10 -n What is the pH if [H + ] = 1x10 -9 ? What is the pH if [H + ] = 1x10 -4 ? What is the [H + ] if pH = 11? What is the [H + ] if pH = 5?

6 pH What is the pH is you have a 2.3x10 -4 M HNO 3 solution? What is the pH is you have a 5.6x10 -5 M H 2 CO 3 solution?

7 pH You can undo pH using the following formulas [H + ] = 10 -pH or [H 3 O + ] = 10 -pH What is the [H + ] if the pH is 5.6? What is the [H 3 O + ] if the pH is 8.7?

8 pH scale How can you measure the pH of a base? Acid Base

9 pOH You can find pOH using the following formula pOH = -log [OH - ] To find the pOH you need [OH - ] If you have a M Ca(OH) 2 solution, what is the [OH - ]?

10 pOH If [OH - ] = 1x10 -n, then pOH = n If pOH = n, then [OH - ] = 1x10 -n What is the pOH if [OH - ] = 1x10 -3 ? What is the pOH if [OH - ] = 1x10 -9 ? What is the [OH - ] if pOH = 4? What is the [OH - ] if pOH = 8?

11 pOH What is the pOH is you have a 5.6x10 -3 M LiOH solution? What is the pOH is you have a 4.7x10 -5 M Sr(OH) 2 solution?

12 pOH You can undo pH using the following formulas [OH - ] = 10 -pOH What is the [OH - ] if the pH is 2.7? What is the [OH - ] if the pH is 4.8?

13 pH and pOH pH + pOH = 14 What is the pH if the pOH is 6.5? What is the pOH if the pH is 3.3?

14 Formulas pH = -log [H + ] or pH = -log [H 3 O + ] pOH = -log [OH - ] [H + ] = 10 -pH or [H 3 O + ] = 10 -pH pOH = -log [OH - ] pH + pOH = 14


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