Water solution of which of these has highest pH ? a)NaCl b)Na2CO3 c)NH4Cl d)CH3COOH

Question

Water solution of which of these has highest pH ? a)NaCl b)Na2CO3 c)NH4Cl d)CH3COOH

Answer 1

d

Answer 2

You need to look at the conjugates- acids form H+ ions, therefore they have H, bases/alkalis form OH- ions, therefore they have OH, CO3 also is basic, and salts/neutral substances have none of this.

NaCl is a salt.

Na2CO3 is a base.

NH4Cl is again a salt.

CH3COOH is an acid.

Now, pH = -log(H+ conc);  -pH = log(H+ conc)

Therefore H+ conc= 10^-pH. So lower the pH higher the hydrogen concentration, right?

Now in basic solutions, there is less oh H+ ions, so pH naturally is greater, therefore, Na2CO3 which is basic has the highest pH.

Note: pOH is the inverse scale of pH

Answer 3

NaCl is neutral, pH = 7

Na2CO3 is basic, pH is greater than 7

NH4Cl is acidic, pH is less than 7

CH3COOH is acidic, acetic acid, pH is less than 7

The solution with the highest pH is Na2CO3, (b).  It's the one with the pH that is greater than 7.

Answer 4

NH4cl. pH means the Hydrogen concentration and Ammonium chloride is having more hydrogen concentration.

Answer 5

NaCl is Neutral, the nuetral substances have pH = 7

Na2CO3 is basic in nature,Therefore the pH>7

NH4Cl is acidic in nature,Therefore the pH<7

CH3COOH (acetic acid) is acidic,Therefore the pH<7

The solution with the highest pH is Na2CO3, (b)

Answer 6

Na2CO3

Answer 7

Highest pH is NH4Cl