4) Las concentraciones de iones de hidrógeno en los quesos van desde \( 4 \times 10^{-7} \mathrm{M} \) hasta \( 1,6 \times 10^{-5} \mathrm{M} \). Determinar el rango correspondiente en las lecturas del pH.

\( \mathrm{H}_{3} \mathrm{PO}_{4}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(1) \rightleftharpoons \mathrm{H}_{2} \mathrm{PO}_{4}^{-}(\mathrm{aq})+\mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq}) \) In the reaction stated above, what happens when more \( \mathrm{H}_{2} \mathrm{PO}_{4}^{-}(\mathrm{aq}) \) is added to the solution? View Available Hint(s) The equilibrium shifts to the left, producing more \( \mathrm{H}_{3} \mathrm{PO}_{4}(\mathrm{aq}) \). The equilibrium shifts to the right, creating more \( \mathrm{H}_{3} \mathrm{PO}_{4}(\mathrm{aq}) \). The equilibrium shifts to the right, creating more \( \mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq}) \). The equilibrium shifts to the left, producing more \( \mathrm{H}_{3} \mathrm{O}^{+} \).

1. C7 Hile ( 9 isomers)

The half-life of Radium- 226 is 1590 years. If a sample contains 500 mg , how many mg will remain after 3000 years? Give your answer accurate to at least 2 decimal places.

The half-life of Radium- 226 is 1590 years. If a sample contains 500 mg , how many mg will remain after 3000 years?

The half-life of Palladium-100 is 4 days. After 24 days a sample of Palladium- 100 has been reduced to a mass of 3 mg . What was the initial mass (in mg ) of the sample? What is the mass (in mg ) 7 weeks after the start? You may enter the exact value or round to 4 decimal places.