## pH Value

 6.2 pH Value

The pH Scale

• The pH scale is a set of number that determines the degree of acidity or alkalinity of a substance.
• The pH value would be:
• 7 for neutral substance.
• > 7 for alkaline substance ($$OH^- > H^+$$)
• < 7 for acidic substance ($$H^+ > OH^-$$)

 $$\xleftarrow[]{\textbf{Acidity } \uparrow}$$ Neutral $$\xrightarrow[]{\textbf{Alkalinity } \uparrow}$$ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

 Definition of pH a logarithmic measurement of the concentration of hydrogen ions, š»+ contained in an aqueous solution.

 Formula of pH $$pH = -log[H^+]$$

 Concentration of Hydroxide Ions, $$OH^-$$ Is used to calculate the pOH value.

 Formula of pOH $$pOH = -log[OH^-]$$

 Hubungan pH dan pOH $$pH + pOH=14$$                              $$pH=14 - pOH$$

Relationship of pH value with Concentration of Hydrogen Ion and Hydroxide Ion
Relationship of concentration $$H^+$$ with pH
 Concentration $$H^+$$ $$\uparrow$$, pH value $$\downarrow$$
Relationship of Concentration $$OH^-$$ with pH
 Concentration $$OH^-$$ $$\uparrow$$, pH value $$\uparrow$$

Measurement of the pH Value of A Solution
 Apparatus for Measuring pH Values

 Universal Indicator
• The universal indicator will change colour, and it indicates what the pH based on the colour produced is.
• The universal indicator can be found in two forms; solution or paper strips.
 pH Meter
• The pH meter is an instrument that is used to measure the pH value of a solution accurately.
• pH meter shows the number of the pH value in the screen.

 The pH Value of Few Items in Daily LifeTested with the Universal Indicator Material pH Value Battery 0 Gastric juice 1 Lemon 2 Vinegar 3 Tomato 4 Coffee 5 Milk 6 Water 7 Blood 8 Baking soda 9 Antacid 10 Ammonia solution 11 Soap 12 Bleach 13 Sewage pipe cleaner 14

## pH Value

 6.2 pH Value

The pH Scale

• The pH scale is a set of number that determines the degree of acidity or alkalinity of a substance.
• The pH value would be:
• 7 for neutral substance.
• > 7 for alkaline substance ($$OH^- > H^+$$)
• < 7 for acidic substance ($$H^+ > OH^-$$)

 $$\xleftarrow[]{\textbf{Acidity } \uparrow}$$ Neutral $$\xrightarrow[]{\textbf{Alkalinity } \uparrow}$$ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

 Definition of pH a logarithmic measurement of the concentration of hydrogen ions, š»+ contained in an aqueous solution.

 Formula of pH $$pH = -log[H^+]$$

 Concentration of Hydroxide Ions, $$OH^-$$ Is used to calculate the pOH value.

 Formula of pOH $$pOH = -log[OH^-]$$

 Hubungan pH dan pOH $$pH + pOH=14$$                              $$pH=14 - pOH$$

Relationship of pH value with Concentration of Hydrogen Ion and Hydroxide Ion
Relationship of concentration $$H^+$$ with pH
 Concentration $$H^+$$ $$\uparrow$$, pH value $$\downarrow$$
Relationship of Concentration $$OH^-$$ with pH
 Concentration $$OH^-$$ $$\uparrow$$, pH value $$\uparrow$$

Measurement of the pH Value of A Solution
 Apparatus for Measuring pH Values

 Universal Indicator
• The universal indicator will change colour, and it indicates what the pH based on the colour produced is.
• The universal indicator can be found in two forms; solution or paper strips.
 pH Meter
• The pH meter is an instrument that is used to measure the pH value of a solution accurately.
• pH meter shows the number of the pH value in the screen.

 The pH Value of Few Items in Daily LifeTested with the Universal Indicator Material pH Value Battery 0 Gastric juice 1 Lemon 2 Vinegar 3 Tomato 4 Coffee 5 Milk 6 Water 7 Blood 8 Baking soda 9 Antacid 10 Ammonia solution 11 Soap 12 Bleach 13 Sewage pipe cleaner 14