White Powder and Unknown Liquid

Yesterday and today in my chemistry class we did a mini lab that experimented with the reactions of combined white powders and unknown liquids to release a gas. We performed three different tests with three different combinations together. The first test we did was with vinegar and sodium bicarbonate which resulted in lots of fizzing and bubbling; creates gas. We used 0.78 grams of sodium bicarbonate and 2 fingers of vinegar which resulted in the production of 0.37 grams of gas. Test number one and two had the result of always being a 1:1 molar ratio which means for every 1 mole of powder used, there should be one mole of gas produced. For test number three is not like the other two because we had to balance the equation by putting a 2 in front of the NaHCO3 and the CO2 which had caused it to become a 2:2 molar ratio. There is a molar relationship between these two substances because you can always determine the amount of gas produced by certain amounts of solid, which is known as the line of best fine, if you have the balanced equations and molar masses. A solid to gas ratio would apply to any and/or all chemical reactions because the only factor in the ratio of gas produced is the type of solid in the reaction. This experiment overall was a very efficient way to help us learn the lesson of the mole and to be introduced to stoichiometry.

Sources:

Class Notes and Class Experiment

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