Limiting Reagent: 50g 0.5M HCl & NaOH-Calc # Mole

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Discussion Overview

The discussion centers around identifying the limiting reagent in a chemical reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), specifically when given 50g of each 0.5M solution. Participants explore how to calculate the number of moles of the limiting reagent and the implications for enthalpy change in the reaction.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested, Homework-related

Main Points Raised

  • One participant asks which reagent is limiting and how to calculate the number of moles of the limiting reagent.
  • Another participant defines the limiting reagent and poses questions about the reaction and its stoichiometry.
  • A third participant identifies the reaction as a neutralization and states the stoichiometric ratio of HCl to NaOH as 1:1.
  • This participant expresses interest in the enthalpy change and seeks to determine the number of moles of each reagent based on their masses.
  • A later reply questions whether the 50g refers to the mass of the 0.5M solution and notes the need for solution densities to proceed with calculations.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the limiting reagent, and multiple views regarding the calculation methods and definitions remain present.

Contextual Notes

Participants have not provided specific molar masses or densities, which are necessary for calculating the number of moles. The discussion is limited by the lack of these details.

kenon
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Limiting reagent?

If there are 50g of 0.5M(molarity) HCl and 50g of 0.5M(molarity) NaOH which are allowed to react, which one is the limiting reagent? How to calculate the number of mole of limiting reagent?
 
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number of moles equals the mass of the substance divided by its molar mass.

Here are some questions for you:

1. What is a limiting reagent?
2. What reaction occurs?
3. In what ratio does it occur?
 
It should be neutralization, where HCl + NaOH ->NaCl + water.

From the equation, the ratio of HCl:NaOH =1:1

Since what i interested in is the enthalpy change of the reaction, so i need to know the number of mole of limiting reagent(the one which is lower in quantity, either HCl or NaOH).

Now i only got the masses of HCl(0.5M) and NaOH(0.5M) in solution, how can i obtain the number of mole of these 2 solution to compare their number of moles?
 
Do you mean 50g of 0.5M solution? If so, you need solution densities to proceed. These are tabelarized.
 

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