A50.0 ml sample of 0.200 m sodium hydroxide is titrated with 0.200 m nitric acid. calculate ph: a. after adding 30.00 ml of hno3 b. at the equivalence point calculate the ph in the titration in example 16.6 after the addition of 60.0 ml of 0.200 m hno3.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.