An acid-base indicator, hln, dissociates according to the following reaction in an aqueous solution. hinlag) in (aq) h (aq) the protonated form of the indicator, hln, has a molar absorptivity of 2929 m cm 1 and the deprotonated form, in has a molar absorptivity of 20060 m-1. cm 1 at 440 nm. the ph of a solution containing a mixture of hin and in s adjusted to 6.12. the total concentration of hin and in s 0.000127 m. the absorbance of this solution was measured at 440 nm in a 1.00 cm cuvette and was determined to be 0.818. calculate pka for hin.

Two things that biomedical has invented or innvated

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?