Which Chemical Compounds Form Acidic Aqueous Solutions?

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Only HCOOH is identified as an acidic aqueous solution among the listed compounds. The discussion highlights the need to recognize functional groups, such as carboxylic acids, to determine acidity. It raises questions about whether one can ascertain acidity from chemical formulas alone and the necessity of understanding reaction products to evaluate ion production. Additionally, the conversation touches on the formation of hydrogen bonds among the compounds, emphasizing the importance of functional group recognition. Understanding these concepts is crucial for identifying acidic properties and molecular interactions in organic chemistry.
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Homework Statement



Which of the following chemical compounds are acidic aqueous solutions?

C2H2, C3H8, CH3OH, HCOOH, CH3OCH and benzene.

Homework Equations

Not known.

The Attempt at a Solution



The hydrocarbons aren't polar, that much I know. In the list there are, however, two polar compounds...

I know the answer is that only HCOOH is an acidic aqueous solution, but no explanation is given. Am I supposed to be able to tell which ones are acidic aquenous solutions simply by looking at the chemical formula? Should I write the reaction first ([compound] + H2O → ...) and if so, how would I know what the products are in each case? After all, wouldn't I need the products in order to determine how much H3O- and HO-ions are produced?
 
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Actually, I also have a second question: which of the above mentioned compunds form hydrogen bonds between molecules? The book gives me the answer but not explanation.

Again, how am I supposed to know this simply by looking at the formulas?
 
It is about functional organic groups and recognizing alcohol, aldehyde and carboxylic acids.
 
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