given a stock solution of 10% dextrose, how would you make 5 mL of a 0.9% dextrose solution? find mL of stock and mL of h20

What would be the working stock concentration (in molarity) if you diluted 250 uL of a stock concentration of 10 uM in a total volume of 1 mL?

I have: DMEM:F12 800X ITS 1.07 g/ml Linoleic acid Nu-serum (pure solution) BSA (pure powder)   How much of each would I need to make 500ml of (1x ITS, 7.49 ug/ml linoleic acid, 4% v/v Nu-serum, 0.15% W/V BSA, and DMEM:F12 as the solvent)?

A 1.000-g sample containing  bromide was dissolved in sufficient water to give 100.0 mL.  A 50.00 mL aliquot was measured and after acidification, silver nitrate was introduced to precipitate AgBr, which was filtered, washed, and then dissolved in an ammoniacal solution of potassium tetracyanonickelate(II): Ni(CN)42- + 2AgBr(s) → 2Ag(CN)2- + Ni2+ + 2Br- The liberated nickel ion required 11.70 mL of 0.002146 M EDTA. The other 50.00 mL remaining solution was also analyzed for its  Br- content by potentiometry using a metallic electrode of the second kind. e) Write the cell notation of the potentiometric set-up with SCE as the reference electrode.    f) Write the Nernst equation that describes the indicator electrode set-up.

Number 3

You are preparing 1 Lt of TAE (Tris Acetate EDTA) gel running buffer from a 50x stock solution. How much 50 x TAE and how much water will you combine?

How many moles of Nal would be found in 250mL of a 4.5 M solution? Write your answer with three digits beyond the decimal point (IMPORTANT - zeroes count as a digit) The answer is moles

Make a 100 ml of a 1M stock solution of NaCl (you will need the molecular weight of NaCl).

How many moles of KBr are there in 89.5 mL of 0.150 M KBr?

6 x 10⁻⁵¹ = (0.15 M)² [S²⁻] [S²⁻] = (6 x 10⁻⁵¹) / (0.15 M)² Calculating, we find the minimum concentration of sulfide ion required: [S²⁻] ≈ 2.7 x 10⁻⁴⁹ M. check it calcution is write