After obtaining calibration curve for your known solution to have slope of 2.5 and intercept of 0.01, you determine that your unknown has Absorbance of 0.2. Is it enough to determine the concentration of your unknown and how

It starts to rust i think

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m

The image seems to be behind the mirror, but nothing is really there. if someone looks behind the mirror, there is no image there.