Which of the following aqueous solutions would test closet to pH 7

  • #1

Homework Statement


>Which of the following aqueous solutions would test closet to 7 on the pH scale?
$a) NaCl$, $b) Na_2CO_3$, $c) NaH_2PO_4$, $d) NaCN$

Homework Equations




The Attempt at a Solution


I don't understand this. So I tried writing chemical equations like for a), NaCl + H20 --> NaOH + HCl, and so on. But for example, HCl (the product in the previous equation) is a strong acid, so I thought it'd have a low pH, but apparently a) is actually the answer, and I don't know how to get that.
 

Answers and Replies

  • #2
BvU
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Perhaps you need a relevant equation ? Any candidates ?
 
  • #3
Borek
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Do the names Brønsted-Lowry ring a bell?
 
  • #4
@Borek — yes, kind of, it was about acids and bases definition, I think.
 
  • #5
Borek
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OK, so try to apply this definition and see what are possible reactions of the substances listed.
 
  • #6
Ygggdrasil
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I don't understand this. So I tried writing chemical equations like for a), NaCl + H20 --> NaOH + HCl, and so on. But for example, HCl (the product in the previous equation) is a strong acid, so I thought it'd have a low pH, but apparently a) is actually the answer, and I don't know how to get that.
You are correct that HCl is a strong acid. Do you know what the definition of a strong acid is? Do you know what the definition of a weak acid is?
 
  • #7
HAYAO
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Do you understand the dissociation constant? Knowing this constant for the acids/bases can help you.
 

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