Acid Strength

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Acid Strength
Grade 10- Science (chemistry)

11/23/2012
Mariana Boff

Acids Strength
Acids are substances that contain hydrogen atoms which detach to form hydrogen ions when the acid is dissolved. Acids are divided into two main categories: the strong and weak acids. The stronger ones are very corrosive and can cause severe skin burns, here are some examples: nitric acid (HNO3), hydrochloric acid (HCl) and sulfuric acid (H2SO4). The weaker ones are less corrosive and when in touch with the skin, usually do not cause burns, for instance some weak acids are: acetic acid (vinegar- CH3COOH), citric acid (C6H8O7) and tartaric acid (C4H6O6). In this investigation I will be focusing in the sulfuric acid and carbonate reaction. Aim: Stronger acids are more reactive.

The purpose of this investigation is to make sure that the stronger acids are more reactive, so according to my aim, I will find out by doing some severe experiments. As a result, the stronger acid will turn the limewater into white faster. Method: in the acid carbonate reactions, I will compare three different strength concentrations of sulfuric acid to see which one is the strongest. I will work out the results by timing how long the limewater takes to turn into white, because of the gas that the reaction produces, which is called carbon dioxide. Variables:

* Independent Variable: strength of sulfuric acid (1M, 2M and 4M). * Dependent Variable: the time the limewater takes to turn into white. * Fixed Variable: grammes of carbonate and millimeters of limewater. Units of measurements:

(these measurements will be used each trial)
* 7ml of each sulfuric acid.
* 5ml of limewater
* 7g of carbonate.
Equipments used:
* 2 test tubes: one for the limewater and the other one for the mixed of the acid and carbonate. * A delivery tube.
* An electronic balance.
* A measuring cylinder (10ml)
* A dropper.
* Timer.

The picture above shows how the experiment will...
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