Question

which of these statements are supported by the data? you can select more than one. co32- increased because dic increased. co32- decreased because ph decreased. ph decreased because pco2 increased. dic increased because ph increased.

Answer 1

The data supports the statements that CO32- decreased because pH decreased, and pH decreased because pCO2 increased. The statement CO32- increased because DIC increased is possible but not confirmed without additional information. DIC increased because pH increased can't be confirmed based solely on the data provided.

Step-by-step explanation:

The question involves understanding the relationships between the dissolved inorganic carbon (DIC), carbonate ion (CO32-), pH, and partial pressure of CO2 (pCO2) in aqueous systems. We must analyze the impact of these variables on each other to deduce which statements are supported by the data provided.

1. CO32- increased because DIC increased: When DIC increases, it suggests an increase in all forms of inorganic carbon, including CO32-. If there is no further information about pH shifts or specific forms of inorganic carbon, we cannot say this relationship is universally true.
2. CO32- decreased because pH decreased: A decrease in pH indicates an increase in H+ ion concentration, which can convert CO32- to HCO3-, hence CO32- would decrease. This is supported by the data.
3. pH decreased because pCO2 increased: An increase in pCO2 leads to more CO2 dissolved in water, forming carbonic acid, which disassociates into H+, causing pH to decrease. This is supported by the data.
4. DIC increased because pH increased: If the pH increases, it indicates a decrease in H+ ion concentration, which could shift the equilibrium to form more HCO3- and CO2, potentially increasing DIC. However, without additional information, we cannot confirm this relationship.