The polyprotic acid sulfurous acid has the following Ka values. Ka1 = 6.0 x 10-3; Ka2 = 5.9 x 10-7. Calculate the pH of a solution containing 25 mL of 0.1 M sulfurous acid when titrated with the following volumes of 0.1M KOH at 20 mL KOH; 25 mL KOH; 30 mL KOH. [Hint: pH at Equivalence Point for polyprotic acids = (pKa1 + pKa2)/2]

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.