In the laboratory you dissolve 19.6 g of nickel(II) fluoride in a volumetric flask and add water to a total volume of 250 mL. What is the molarity of the solution? What is the concentration of the nickel cation? What is the concentration of the fluoride anion? M. M. M.

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The concentration of methylene blue in the sample is estimated through (select the correct)   options:   refractive index measurement (refractometry).   turbidity measurement (turbidimetry).   absorbance measurement (spectrophotometry).   titration with 2% HCl solution.

A student weighed out 0.150 g of protein powder and dissolved it in 100 mL of water (Solution 1). The student then diluted this solution by transferring 1 mL into a 25 mL flask and diluting with water (Solution 2). Finally, 1 mL of that solution was transferred to a test tube and combined with 4 mL Bradford reagent. The absorbance of the solution in the test tube was 0.187. Assuming that the best fit linear line of the standard curve was y = 0.04144 x + 0.01521 (μ g mL), calculate the percent protein by mass in the original protein powder.

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The feedback I got for these answers is that 5/6 are correct. Can you clarify on which one you might think is incorrect?

A student weighed out 0.150 g of protein powder and dissolved it in 100 mL of water (Solution 1). The student then diluted this solution by transferring 1 mL into a 25 mL flask and diluting with water (Solution 2). Finally, 1 mL of that solution was transferred to a test tube and combined with 4 mL Bradford reagent. The absorbance of the solution in the test tube was 0.11. Assuming that the best fit linear line of the standard curve was y = 0.04144 x + 0.01521 (μ g mL), calculate the percent protein by mass in the original protein powder.

M Apple Google Disney ESPN Yahoo! Biomedical Careers Program Apple iCloud Yahoo Images Bing Google Wikipedia COWLv2 |... b D2L ☆ & G For the reaction r r Submit Answer prod03-cnow-owl.cengagenow.com Fe(s) + 2HCI(aq)→→→FeCl₂(s) + H₂(g) AH° = -7.4 kJ and AS° = 107.9 J/K D2L D2L D2L Facebook Twitter LinkedIn Use the References to access important values if needed for this question. The Weather Channel Yelp TripAdvisor b D2L M G C The maximum amount of work that could be done when 2.08 moles of Fe(s) react at 286 K, 1 atm is Assume that AH° and ASº are independent of temperature. Retry Entire Group 4 more group attempts remaining kj. +88 M

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analyte concentration(C)(mg/ml) injection volume (ul) elution time (time) peak DAD signal(mAU) caffeine 1 1 4.67 302.85 aspartame 5 1 7.53 15.83 benzoic acid 1 1 8.14 89.98 saccharin 1 1 1.91 84.86 mixture(add everything above with 1:1:1:1 ratio)   1 4.47 69.58 How to get the concentration of the mixture in this case?