How would you make up 1 L of a 20X stock solution of the following buffer? 50mM glucose (FW=180.16) 25mM Tris (FW 121.1) 10mM EDTA (FT=372.24) I think, I already calculated the grams of each one, but I don't know how to do the 20X Glucose: 9.008g Tris: 3.02g EDTA:3.72G
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How would you make up 1 L of a 20X stock solution of the following buffer?
50mM glucose (FW=180.16)
25mM Tris (FW 121.1)
10mM EDTA (FT=372.24)
I think, I already calculated the grams of each one, but I don't know how to do the 20X
Glucose: 9.008g
Tris: 3.02g
EDTA:3.72G
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- A 1.067g sample of magnesium oxide of 84.736% were treated with 50mL of 1.017 N Sulfuric Acid, and a 5.195mL volume of sodium hydroxide is required in the back titration. 1. What is the equivalent weight consumed by the acidic titrant? A. 5.281 g-meq B. 55.150 g-meq C. 5.723 g-meq D. 50.850 g-meq 2. What is the difference of milliequivalent weight consumed in the reaction? A. 45.127g-meq B. 56.573g-meq C. 50.850g-meq D. 55.150g-meq 3. What is the amount (in mg) of the analyte that is equivalent to 1 milliliter of the tirant at its equivalence point? A. 22.060mg B. 40.680mg C. 44.12mg D. 20.340mgWhat is the component concentration ratio, [Pr−]/[HPr], of a buffer that has a pH of 4.98?(Ka of HPr = 1.3 × 10−5) Report your answer to 3 significant figures.1. The molar solubility of Ag2SO3 is 1.55× 10-4 M. Calculate the Ksp of Ag2SO3. a. 7.45 x 10^-12 b. 1.55 x 10^-4 c. 2.40 x 10^-8 d. 1.49 x 10^-11 e. 3.72 x 10^-12 2. What is the difference between the end point of an acid–base titration and the equivalence point? a. There is no difference; these are just two terms meaning the same thing. b. At the end point, the acid and base are present in equal numbers of moles. At the equivalence point, the indicator changes color. c. The end point is always at pH 7 but the equivalence point can be at various pH values. d.The end point can be at various pH values but the equivalence is point always at pH 7. e. At the end point, the indicator changes color. At the equivalence point, the acid and base are present in equal numbers of moles A solution at 25 °C that contains 1× 10-8 M H3O+ is a. basic b. acidic c. neutral d. both acidic and basic