You will titrate 25.00ml of histidine dihydrochloride solution of unknown concentration with the secondary standard naoh solution prepared in the last experiment. the unknown histidine dihydrochloride solutions have concentrations in the range 0.022-0.030m. use a value of 0.025m histidine dihydrochloride to estimate the volume of naoh required to completely deprotonate the histidine dihydrochloride. you will need to use the concentration of naoh from your last experiment. this calculated volume is an estimate of the third equivalence point. use this value to estimate the first and second equivalence point volumes.

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Stage in which a star’s outer layers have started to cool and grow outward?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.