# 45.6: General Questions


1. Classify each substance in the chemical equations as an acid or base, by determining for each substance whether it is a proton donor or a proton acceptor.

1. $$\ce{NH3} + \ce{H2O} \leftrightarrow \ce{NH4} + \ce{OH}$$

2. $$\ce{H2O} + \ce{HCO3} \leftrightarrow \ce{H3O} + \ce{CO2}$$

2. Is there a trend for determining the acid and base when the reaction is reversed?  Explain the trend.