today, i did a lab on the molar volume of hydrogen gas. in this experiment, we poured around 10 mL of hydrocholric acid into a gas collection tube with water and measured the volume of gas to be around 20.9 mL.
would changing the molarity of the hydrochloric acid affect the final results? explain.
no, it would change the rate of the reaction is all. I assume you had an excess of acid. Now if you did not have an excess of acid, that is another matter.
yes we did.
so would it slow or speed up the rate of the reaction?
if you dilute, it slows it down.
Yes, changing the molarity of the hydrochloric acid would affect the final results in the experiment on the molar volume of hydrogen gas. Let's break down the explanation step by step:
1. Basics of the Experiment:
The experiment involves generating hydrogen gas by reacting hydrochloric acid with a suitable metal (e.g., zinc) in the presence of water. The hydrogen gas is then collected and its volume is measured.
2. Role of Hydrochloric Acid:
Hydrochloric acid (HCl) is used as the source of hydrogen ions (H+). It reacts with the metal (e.g., zinc) to produce hydrogen gas as one of the products. The concentration or molarity of the hydrochloric acid represents the amount of HCl present in a given volume of solution.
3. Effect of Hydrochloric Acid Concentration:
Changing the molarity of the hydrochloric acid affects the number of hydrogen ions available for reaction. In other words, it determines the amount of hydrochloric acid available to react with the metal, which directly affects the amount of hydrogen gas produced. Higher concentration of hydrochloric acid means more hydrogen ions available, leading to a higher rate of the reaction and more hydrogen gas produced.
4. Impact on Molar Volume:
In the experiment, the molar volume of hydrogen gas is determined by dividing the volume of hydrogen gas collected (in mL) by the number of moles of hydrogen gas generated. The number of moles of hydrogen gas is directly proportional to the amount of hydrochloric acid used.
5. Concluding Remarks:
Changing the molarity of the hydrochloric acid will affect the amount of hydrochloric acid used and, consequently, the number of moles of hydrogen gas produced. Therefore, increasing or decreasing the concentration of hydrochloric acid will affect the final results by altering the amount of hydrogen gas collected, ultimately affecting the calculated molar volume.
In summary, changing the molarity of the hydrochloric acid will impact the final results of the molar volume of hydrogen gas experiment due to its influence on the amount of hydrogen gas produced.