Record qualitative and quantitative data in tables with headings and units, process them with correct significant figures and uncertainties, and present them in graphs that support the conclusion.
(a) The graph shows how the water level of the Salton Sea has changed since 1950. The reference point for the water level is sea level. (i) Suggest a reason why the values plotted on the vertical axis are negative. (ii) The surface area of the Salton Sea was…
Explain how the calibration curve is then used to determine the concentration of in a reaction mixture of unknown concentration.
In water, HOBr partly ionizes to give the hypobromite ion, ; the ion is a much weaker sanitizer than the un-ionized acid. The graph shows how the percentages of the dissolved bromine present as HOBr(aq) and as (aq) vary with pH at 25 °C.…
Ammonia from sweat and skin-care products reacts with HOBr to form bromamines: , and . (i) Deduce an equation for the reaction of ammonia with HOBr(aq) that produces dibromamine, (aq). (ii) The graph shows how…