Chemistry

Chemistry, 27.07.2019 05:30, sodaswann

If 65.5 ml of hcl stock solution is used to make 450 ml of a 0.675 m hcl dilution, what is the molarity of the stock solution ?

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Chemistry, 05.07.2019 18:30, eliana12

In lab 11 you make a stock solution of salicylic acid, and then four dilutions. the stock solution is made by diluting 5.00 ml of 1.250 x 10-2 m salicylic acid in 50.00 ml of solution. you then make the four dilutions as follows: dilution #1 = 10.00 ml of stock diluted to 25.00 ml dilution #2 = 7.50 ml of stock diluted to 25.00 ml dilution #3 = 5.00 ml of stock diluted to 25.00 ml dilution #4 = 2.50 ml of stock diluted to 25.00 ml determine the concentrations of the stock solution and four dilutions and enter them in the tables below.

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Chemistry, 17.07.2019 12:00, Redhead667

If 65.5 ml of hcl stock solution is used to make 450 ml of a 0.675 m hcl dilution, what is the molarity of the stock solution ?

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Chemistry, 14.10.2019 18:30, hanjonez

Prepare ~ 8.75 × 10–4 m cro4 solution from the ~1.25× 10–3 m k2cro4 stock solution. record the exact molarity of the stock solution. calculate the required amount of stock solution to make 10.00 ml of dilute solution. adjust this value as necessary (ratio) based on the volumetric flask available.

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Biology, 14.11.2019 06:31, jak000067oyyfia

•determine concentration of enzyme stock solution, if unknown, by taking an a280 nm reading of a 1: 100 dilution (in water). use a total volume of 1 ml in the cuvette. • dilute some of the enzyme stock with buffer a to make a 4 mg/ml solution. • serially dilute the 4 mg/ml solution with buffer a to make working solutions of 400 µg/ml and 40 µg/ml. • prepare 30 µl of each working solution for every sample the pi of the lab gives you a tube of enzyme and tells you the following before disappearing into the office to write more grant proposals: ➢ there is 50 µl of enzyme stock solution. the enzyme is expensive to purify, so follow the protocol exactly, using as little of the stock solution as possible. ➢ the concentration of the stock solution is currently not known, but a 1 mg/ml concentration of the pureenzyme has an a280 nm of 2.0. ➢ you’ll be performing the assay on 12 samples. ➢ make enough of each working solution so that you have at least 400 ul to work with when you do the assay (to cover any waste and/or inefficiencies in pippetting). using the spectrophotometer to read the absorbance at 280 nm, you get a reading of 0.784. 1. (2 pts) what is the concentration of the solution in the cuvette? what is the concentration of the stock

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If 65.5 ml of hcl stock solution is used to make 450 ml of a 0.675 m hcl dilution, what is the molar...

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