Answer:
when sodium hydrogen carbonate(NaHCO3) is added. The pH will increase, or become more basic.
Step-by-step explanation:
Step 1: Data given
The solution contains carbonic acid = H2CO3
H2CO3 is a weak acid.
We'll add sodium hydrogen carbonate = NaHCO3
Step 2: What will happen to the pH
When we add NaHCO3, there will be formed a buffer of H2CO3/HCO3-
pH = pka+log ([A-]/[HA])
pH = pka+log ([HCO3-]/[H2CO3])
When NaHCO3 is added, [HCO3-] will be greater.
When [HCO3-] will be greater, ([HCO3-]/[H2CO3]) will be greater
When ([HCO3-]/[H2CO3]) will be greater, the pH will increase.
This means when sodium hydrogen carbonate(NaHCO3) is added. The pH will increase, or become more basic.