What Happens to HCl Concentration and Antacid Dissolution with Increased Volume?

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Discussion Overview

The discussion revolves around the effects of increasing the volume of hydrochloric acid (HCl) on its concentration and the dissolution rate of an antacid tablet. Participants explore the implications of changing volume in both theoretical and practical contexts, including stoichiometry and saturation points.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants question whether increasing the volume of HCl changes its concentration, with clarifications needed on whether more acid is added or if it is diluted with water.
  • One participant asserts that concentration will change if more moles of HCl are added, while dilution with water will lower the concentration.
  • Another participant emphasizes that concentration is an intensive property and does not depend on the amount of solution, suggesting that adding more acid solution does not affect concentration.
  • Participants provide examples involving different volumes and concentrations of HCl, discussing how these changes impact the concentration and potential saturation of the solution.
  • There is a mention of the saturation point affecting the dissolution rate of the antacid tablet, with some suggesting that if the solution is saturated, the rate of dissolution will slow down.
  • Corrections are made regarding calculations of concentration changes when different volumes and molarities of HCl are mixed, indicating uncertainty in the initial claims.

Areas of Agreement / Disagreement

Participants express differing views on whether increasing the volume of HCl affects concentration, with some asserting it does and others suggesting it does not. The discussion remains unresolved regarding the specific effects on antacid dissolution rates in varying volumes of HCl.

Contextual Notes

Limitations include ambiguity in the definitions of "increasing volume" and the conditions under which concentration is considered, as well as unresolved calculations regarding the effects of mixing different concentrations of HCl.

Who May Find This Useful

This discussion may be useful for individuals interested in chemistry concepts related to acid-base reactions, concentration calculations, and the dissolution behavior of substances in solutions.

Seinfeld4
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Hey, I'd appreciated an answer to a really basic chemistry question.

If I increase the volume of 1.0 mol/L hydrochloric acid from 50mL to 100mL, does that change the concentration?

Will an antacid tablet dissolve more quickly in 50mL or 100mL of hydrochloric acid?
 
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Seinfeld4 said:
If I increase the volume of 1.0 mol/L hydrochloric acid from 50mL to 100mL, does that change the concentration?

What do you mean by "increase the volume"? Do you add more acid, or do you dilute it with water?

Will an antacid tablet dissolve more quickly in 50mL or 100mL of hydrochloric acid?

Same concentration of acid?
 
Either way, the concentration will change. Look at how you measure concentration: moles per litre. More moles of HCl will make the fraction bigger => higher concentration. If you add more water, the fraction will be smaller, and your concentration will be lower.

On a side note, HCl in aqueous solution exist as H+ and Cl-. That's why it's a strong acid, total protonation.As to your tablet question. Consider this: when you dissolve something in water, you have a finite "bonding places". When that number is reached, your solution is saturated, and you can't solve more. The closer you get to your saturation point, the slower the solving will take. This rate is decreasing exponentially. Not sure if that made any sense...
 
Chem.Stud. said:
Either way, the concentration will change.

Not necessarily, although I see what I posted was ambiguous. What I meant by "adding more acid" was "adding more acid solution". Concentration is an intensive property and doesn't depend on the amount of the solution.

Not sure if that made any sense...

It is not wrong, but to know if it applies you will have to check the stoichiometry and solubility. Could be we are very far from the saturation.
 
We have 10mL 1M HCl.

1. add 30mL 1M HCl to original solution: won't affect concentration of HCl.
2. add 30mL 2M HCl to original solution: will affect concentration of HCl to 1,333M
3. add 30mL pure water to original sollution: will reduce [HCl] to 0,04M

If one tablet will saturate 5mL water, then there probably won't be much difference in the dissolving rate in 50mL water and 100mL water. Should one tablet, however, saturate 105mL water, then I guess there will be. Just an example of course.
 
Compaq said:
We have 10mL 1M HCl.

1. add 30mL 1M HCl to original solution: won't affect concentration of HCl.
2. add 30mL 2M HCl to original solution: will affect concentration of HCl to 1,333M
3. add 30mL pure water to original sollution: will reduce [HCl] to 0,04M

If one tablet will saturate 5mL water, then there probably won't be much difference in the dissolving rate in 50mL water and 100mL water. Should one tablet, however, saturate 105mL water, then I guess there will be. Just an example of course.

Check your calculations for 2 and 3, but the direction of the effect is right.
 
Ohh, yeah, too fast in the turns!2. is supposed to be 1.75M
3. is supposed to be 0,25

Not sure what I was doing, lol
 
Seinfeld4 said:
Hey, I'd appreciated an answer to a really basic chemistry question.

If I increase the volume of 1.0 mol/L hydrochloric acid from 50mL to 100mL, does that change the concentration?

Will an antacid tablet dissolve more quickly in 50mL or 100mL of hydrochloric acid?

[tex]concentration = \frac{mol}{Volume}[/tex]

What do you think what happens to concentration if you duplicate volume?
 

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