1) Write equations that show H2PO4− acting both as an acid and as a base.

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1) Write equations that show H2PO4 acting both as an acid and as a base.

 

2) Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:

(a) 0.200 M HCl

(b) 0.0143 M NaOH

(c) 3.0 M HNO3

(d) 0.0031 M Ca(OH)2

 

3)Propionic acid, C2H5CO2H (Ka = 1.34 × 10−5), is used in the manufacture of calcium propionate, a food preservative. What is the hydronium ion concentration in a 0.698-M solution of C2H5CO2H?

Expert Solution
H2PO4 (-) as a base

According to Bronsted concept, a base is the one that accepts the proton from the acid.

H2PO4-   +  H+ H3PO4 

Base                         Conjugate acid

 

Note: Here, H2PO4- acts as a Bronsted base as it is a proton acceptor.

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