The reaction of sulfuric acid (H2SO4) with potassium hydroxide (KOH) is described by the equation:

H2SO4 + 2KOH → K2SO4 + 2H2O

Suppose 50 mL of KOH with unknown concentration is placed in a flask with bromthymol blue indicator. A solution of 0.10 M H2SO4 is dripped into the KOH solution. After exactly 33.4 mL of H2SO4 is added, the indicator changes from blue to yellow. What is the concentration of the KOH?

A. 0.067 M
B. 0.13 M
C. 0.15 M
D. 0.26 M

Adilute aqueous potassium nitrate solution is

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.

What is the relationship between particles in matter