Calculate the [OH−] and the pH of a solution with an [H+]=5.3×10−10 M at 25 °C. [OH−]=
pH=

Calculate the [H+] and the pH of a solution with an [OH−]=3.6×10−5 M at 25 °C .
[H+]=
pH=

Calculate the [H+] and the [OH−] of a solution with a pH=6.92 at 25 °C.
[H+]=
[OH−]=

Please help quickly! I am being timed!
Thank you!

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.