a volume of 25.0 mL of a 0.20M unknown weak acid is titrated with 0.1M NaOH After 15.0mL base addition. The pH is measured at 2.92. Calculate the Ka of the unknown acid.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

the objects have the same charge.