A student adds 0.70 mL of 1.0 M HCl instead of 7.0 mL of concentrated HCl as she supposed to when attempting the green crystal synthesis. The product she obtained was light red pink in color. Explain.

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