Understanding Acid-Base Reactions: pH Levels of Common Substances

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SUMMARY

The pH of 0.01M Methylammonium chloride is confirmed to be lower than 7, indicating its acidic nature due to Methylammonium being a weak base. Potassium cyanide has a pH of approximately 11 in a 0.1N aqueous solution, demonstrating its strong basic properties despite HCN being a weak acid. Sodium methanoate exhibits a pH range of 8 to 9.5, reflecting the dominance of hydroxide ions from Sodium Hydroxide over the weak Methanoic acid. These conclusions clarify the pH behavior of these substances in aqueous solutions.

PREREQUISITES
  • Understanding of pH scale and its implications
  • Knowledge of weak and strong acids and bases
  • Familiarity with Methylammonium chloride and its properties
  • Basic chemistry concepts regarding aqueous solutions
NEXT STEPS
  • Research the properties of Methylammonium chloride in detail
  • Learn about the dissociation constants of weak acids and bases
  • Investigate the pH calculations for various concentrations of potassium cyanide
  • Explore the effects of different solvents on pH measurements
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Chemistry students, educators, and professionals interested in acid-base reactions and pH level analysis of common substances.

josephcollins
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Here's another I want to just check with you

The pH of 0.01M Methylammonium chloride (not from the last thread)is lower than 7, correct? As Methylammonium is a weak base and HCl a strong acid?

The pH of potassium cyanide will 7? Both KOH and HCN are very strong?

And finally, the pH of sodium methanoate. This is greater than 7 as Sodium Hydroxide is a strong base and Methanoic acid a weak acid with the OH- predominating?

Thanks,
Joe
 
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Do you know the pH scale?

The pH of potassium cyanide will 7,

No 7 is netrul, 7+ = basic, 7- = acidic.

The pH of potassium cyanide will be = 11 (0.1 N aqueous solution). Use 11.

pH of sodium methanoate = 8-9.5

Methylammonium chloride = 8 (0.1N)
 
josephcollins said:
The pH of 0.01M Methylammonium chloride (not from the last thread)is lower than 7, correct? As Methylammonium is a weak base and HCl a strong acid?

I think it is very close to 7 or 6; according to the neutral point of the water sample used (carbondioxide free water gives a plain 7 pH value, I think).

The pH of potassium cyanide will 7? Both KOH and HCN are very strong?

No. HCN is a very very weak acid, so the pH is even greater than KOH; cyanide is a very strong base since there is a very reactive three-bonded carbon with a non-bonded electron pair.

And finally, the pH of sodium methanoate. This is greater than 7 as Sodium Hydroxide is a strong base and Methanoic acid a weak acid with the OH- predominating?

Yes, this is okay.
 

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