Final answer:
The concentration of SE2− in a 0.074 M solution of hydroselenic acid, H2SE, can be calculated using equilibrium constants for the acid's dissociation, but these values are required to provide a precise answer. Since H2SE is a weak acid, the concentration of SE2− will be significantly lower than the initial concentration of the acid.
Step-by-step explanation:
To calculate the concentration of SE2− in a 0.074 M solution of hydroselenic acid (H2SE), we first need to understand that H2SE is a weak diprotic acid and will dissociate in water to form H+ (or H3O+) and SE2− ions. The dissociation occurs in two steps, with the first H+ ion being released followed by another. Given that the dissociation constants for H2SE are low, particularly the second dissociation constant, the concentration of SE2− will be significantly less than the initial concentration of H2SE.
Without knowing the exact dissociation constants for H2SE (pKa values), a precise calculation cannot be made. However, one can infer that the concentration of SE2− will be low and would typically require applying an equilibrium calculation involving these dissociation constants to find the exact concentration of SE2− under given conditions.