Question

question 8
what substance is responsible for the alkalinity of pancreatic juice?
sodium bicarbonate
salts
water
digestive enzymes

Explanation:

Pancreatic juice contains sodium bicarbonate ($\ce{NaHCO3}$). Sodium bicarbonate is a basic substance. When it dissociates in pancreatic juice, it releases bicarbonate ions ($\ce{HCO3-}$). These bicarbonate ions can react with hydrogen ions ($\ce{H+}$) in the acidic chyme entering the small intestine from the stomach. The reaction is $\ce{HCO3- + H+ = H2O + CO2↑}$. This reaction neutralizes the acidity of the chyme and creates an alkaline environment, which is beneficial for the action of digestive enzymes in the small intestine. Salts in a general sense (not specifically sodium bicarbonate) do not primarily contribute to the alkalinity. Water is neutral. Digestive enzymes are proteins that function in the alkaline environment provided by sodium bicarbonate but do not themselves cause the alkalinity.

Answer:

Sodium bicarbonate