Creating a buffer out of 0.100M solutions

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SUMMARY

The discussion focuses on determining which combinations of 0.100M solutions of acetic acid, sodium hydroxide, and hydrochloric acid can create a buffer. It is established that mixing 20.00mL of acetic acid with 30.00mL of NaOH does not yield a buffer due to the excess strong base. Conversely, mixing 30.00mL of acetic acid with 20.00mL of NaOH does create a buffer as it maintains both the weak acid and its conjugate base. The user seeks clarification on the buffer status of two additional combinations involving all three solutions.

PREREQUISITES
  • Understanding of buffer solutions and their components
  • Knowledge of acetic acid and sodium hydroxide reactions
  • Familiarity with molarity calculations
  • Basic principles of acid-base chemistry
NEXT STEPS
  • Research the Henderson-Hasselbalch equation for buffer calculations
  • Explore the concept of buffer capacity and its significance
  • Learn about the role of strong acids and bases in buffer systems
  • Investigate the preparation of buffer solutions using different weak acids and their salts
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Chemistry students, educators, and laboratory technicians involved in acid-base chemistry and buffer solution preparation.

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Homework Statement


The questions asks which of the following would make a buffer given that all solutions are 0.100M and you have solutions of acetic acid, sodium hydroxide, and hydrochloric acid.
  1. 20.00mL of each solution is mixed.
  2. 20.00mL of acetic acid and 30.00mL of NaOH are mixed
  3. 30.00mL of acetic acid and 20.00mL of NaOH are mixed
  4. 20.00mL of acetic acid and 20.00mL of NaOH and 10.00mL of HCL are mixed.

Homework Equations


None necessary

The Attempt at a Solution


So I know that 2. is wrong because once all the acetic acid and NaOH are mixed, there will be 10 mL left of a strong base which is not a buffer. I know 3 is right because 30.00mL of acetic acid added to 20.00mL of NaOH will leave 10.00mL plus some base when the NaOH reacts so that creates a buffer. However I am not sure how to solve 1 and 4 with 3 solutions each. Does anyone have any advice for determining if 1 and 4 are right?
 
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Buffer needs both weak acid and its conjugate base to be present. Will they be present in 1. and 2.?
 
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