Some carbonated beverages are made by forcing carbon dioxide gas into a beverage solution. When a bottle of one kind of carbonated beverage is first opened, the beverage has a pH value of 3.
80. State, in terms of the pH scale, why this beverage is classified as acidic. [1]
HIGHLIGHT TO SEE THE ANSWER
the pH is less than 7, so it is acidic |
81. Using Table M, identify one indicator that is yellow in a solution that has the same pH value as this beverage. [1]
HIGHLIGHT TO SEE THE ANSWER
bromthymol blue bromcresol green thymol blue these indicators are yellow for a pH of 3.0 |
82. After the beverage bottle is left open for several hours, the hydronium ion concentration in the beverage solution decreases to 1/1000 of the original concentration. Determine the new pH of the beverage solution. [1]
HIGHLIGHT TO SEE THE ANSWER
pH=6 1/1000 has 3 zeros pH changes by 3 since hydronium concentration decrease it becomes less acidic (more basic) the pH increases so a pH of 3 becomes 6 |