What is the Limiting Reactant in this HCl and Mg Reaction?

• yjk91
In summary, for this experiment, the first step is to add 25 mL of HCl solution to each flask. Then, you must weigh out 0.15g, 0.3g, and 0.6g of Mg ribbon and place each sample into its own balloon. The chemical equation for this reaction is Mg + 2HCl --> H2 + MgCl2. To determine the limiting reactant for each reaction, you will need to calculate the number of moles of HCl using the given molarity of 1M. Then, using the 2:1 HCl to Mg ratio, you can calculate the number of moles of Mg for each amount weighed. The limiting reactant can be
yjk91

Homework Statement

Procedure
2. Weigh out 0.15g, 0.3g, and 0.6g of Mg ribbon and place each sample into its own balloon

Homework Equations

Mg + 2HCl --> H2 + MgCl2

The Attempt at a Solution

show the calculations determining the limiting reactant for each reaction.

Help on how to get the limiting reactant!

And using the limiting reactant as the starting amount, determine the amount of hydrogen gas that was produced per reaction flask:

I think you need to know the molarity of HCl.

oh my bad 1.0moles HCL/1L or 0.1 moles HCL/100mL solution

Since you know the molarity of HCl to be 1M, you can compute how many moles of HCl you have at 25mL. The formula Molarity = mole/volume in Liter, or mole = Molarity x Volume in liter.
Further, based on your equation, you know you need a 2 HCL to 1 Mg ratio.
So just figure out how many moles of Mg you have at .15g, .3 and .6
From that you can see your limiting reactant.

1. What is a limiting reactant?

A limiting reactant is a substance that is completely consumed in a chemical reaction, thereby limiting the amount of product that can be formed.

2. How is the limiting reactant determined?

The limiting reactant is determined by comparing the mole ratios of the reactants present in a chemical reaction. The reactant with the lowest mole ratio is the limiting reactant.

3. Why is it important to find the limiting reactant?

It is important to find the limiting reactant because it allows us to accurately predict the amount of product that will be formed in a reaction. Without knowing the limiting reactant, we may not be able to produce the desired amount of product.

4. Can the limiting reactant change during a reaction?

No, the limiting reactant remains the same throughout the reaction. However, the excess reactant may be used up, resulting in a different limiting reactant if there are multiple reactants present.

5. How does the concept of limiting reactant relate to stoichiometry?

The concept of limiting reactant is closely related to stoichiometry, which is the study of the quantitative relationships between reactants and products in a chemical reaction. By determining the limiting reactant, we can accurately calculate the amount of product that will be formed based on the given stoichiometric ratios.

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