Improving upon the capabilities of indicator paper, pH meters are able to quanti

Question

Improving upon the capabilities of indicator paper, pH meters are able to quantitatively measure the acidity of a solution. All pH values that follow are measurements of 0.010 M solutions. For ions, the values represent solutions of the sodium salts of the ion. Drawing Lewis structures will help you see the structure–pH relationship more clearly. If uncertain of the atom attachments ask your instructor.

4.   Rank the acids by increasing acid strength:

Species pH Species pH Species pH HClO4 2.00 SO32– 9.60 H2S 4.50 H2SO4 2.00 HCl 2.00 HPO42– 9.60 H3PO4 2.24 H2PO4– 4.60 HBr 2.00 ClO– 9.73 HI 2.00 SO42– 7.00 ClO4– 7.00 H2SO3 2.18 PO43– 11.89 HSO4– 2.88 CH3COOH 3.37 NaOH 12.00 HClO 4.73 HS– 9.50 HNO2 2.72 HSO3– 4.60 H2O 7.00 Cl– 7.00

Explanation / Answer

Acid is strong if pH is less, means lesser the PH stronger is the Acid. Also lesser the Pka stronger is the acid.

In the given table HCl, HBr and HI are having same PH-2. In this case Pka is deciding factor.

HCl = -7
HBr = -9
HI = -10

HI is the strongest than HBr than HCl.

Same is applicable for HClO4 and H2SO4

So now we can rank easily with increase in Acid strength.

NaOH, PO43–, ClO–, HPO42–, HS–, H2O, ClO4–, Cl– , SO4–, ClO4–, HClO, HSO3–, H2PO4–, H2S, CH3COOH, HSO4–, H2SO3, HNO2, H3PO4, H3PO4, HBr, HI, H2SO4, HClO4.

So HClO4 is strongest acid while NaOH is weakest.

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