A micropipette is certified by the manufacturer at 50.0 μL TD, ± 1.5% (95% confidence). An analyst performs a routine calibration check by pipetting a series of 5 aliquots of deionized water into a tared vial. The water is at a temperature of 25.0°C. Using the following data as obtained by the analyst determine if the micropipette performing according to specifications. Also, determine the %RSD, the Z value and the 95% CI D Analyst 1: Weight (cumulative), g Analyst 2: Weight (cumulative) g. 0.0494 0.0578 0.0997 0.1020 0.1484 0.1205 0.1985 0.1857 0.247 0.01987

Human saliva contains the enzyme α-amylase which hydrolyzes polysaccharide acetal linkages.  A soda cracker (containing starch) was carefully ground; the crumbs were distributed evenly between two test tubes.  The first test tube contained only water, while the second contained a 1% solution of α-amylase.  Both mixtures were heated to 35°C for 10 minutes and filtered. The filtrates were tested with iodine solution and Benedict’s solution.  Use the following results to answer the questions below.   Mixture Iodine test Benedict’s Test cracker in water dark blue blue cracker in water and α-amylase red red-orange precipitate a.       Was the starch from the cracker/water mixture hydrolyzed? Was the starch from the cracker in the 1% α-amylase solution hydrolyzed? b.       Which cracker contained reducing sugars?

Gypsum (CaSO4) is a common percipitant in water desalination. CaSO4 <=> Ca2+ + SO42-     where Ksp=10-4.6. Assuming that:   [Ca2+]=2x10-2 M; [SO42-]=2x10-3M: a) Find Qsp or IAP for the given water b) Find the solubility index (SI) and determine whether CaSO4 is under, super, or at saturation in water. Feel free to make any assumptions you wish, as long as they're stated.

Please I need the answer in 30 minutes

> EL session.masteringchemistry.com MasteringChemistry ROSTER-2019-SPRI-PULLM-CHEM-101 blackboard wsu Google Search MasteringChemistry: HW 8 KHW 8 Applications for Dilution Calculations K8 of8 Dilution as a procedure in analysis We sometimes purposely dilute solutions if the analyte concentrations wavelengths in the visible (and sometimes uitraviolet) range. Based on the dissolved solute's properties, we can quantify that solute's concentration are too high to permit an accurate measurement. For example, a spectrophotometer can measure the amount of light that passes through a sample solution for If the solute's concentration is too high, a relatively small amount of incident light having the wavelength that corresponds to the solute's absorption behavior will less light is absorbed, and the detector in the spectrophotometer can generate more reliable data. reach the dete ctor, which results in an inaccurate measurement (consider the result if you blocked the light with an opaque…

Calculations. 1. Standard solutions and Beer's law calibration curve (1) Mass of SA Molar mass of salicylic acid (SA), HOC6H4COOH (2) Moles SA = mass/molar mass 0,165 138.1 0,500 = (0.500/10.0)x(stock solution concentration) /o. 6 0.100 (3) Concentration of SA stock solution = mol/0.100L = (2)/0.100 = SA solution "4" (0.400 mL stock to 10.0 mL) = 0.1658 SA solution "3" (0.300 mL stock to 10.0 mL) = The SA is hydrolyzed and quantitatively transferred to a 100 mL volumetric flask, so: 11997 / 0 SA solution "2" (0.200 mL stock to 10.0 mL) (4) Concentration of SA solution "5" (0.500 mL stock to 10.0 mL) 33 x 2762 = SA solution "1" (0.100 mL stock to 10.0 mL) 138.1 -1.1947 mol SA x 10 11 g/mol 33 2762 -3 mol/L mol/L As=0-888 mol/L A+ = +695 0.422 A2 = 0.351 A₁ = 0,1 mol/L mol/L mol/L A₁ = 0. ter these concentrations and absorbance in an Excel sheet and create a calibration curve. Attach s calibration curve with this report.

Solution Q number 1

What is the percentage of organic compound that is dissolved in soil pore water that has a porosity of 0.41 and the Kd = 563 L kg-1 ? Report your answer in percentage and enter it is X.Xx10(-X) or X.Xx10(X)

Mganga is doing a routine analysis in a copper plating factory. He is regularly making up solutions of verypure CuSO4.5H2O. He suspect that a batch of a reagent used to make up a stock solution of CuSO4.5H2Ois impure and it may contains some CuCl2. He asked you to determine the percentage impurity as follows:Dissolve1.500g of a mixture and make up to 1.00L mark.150mL of this solution was treated with 20.00mLof 0.100M AgNO3 to remove 98.6% of chloride as AgCl precipitate.

The gravimetric factor used to express CoCBr6·H20 in a sample that is finally weighed as PbClBr is choose below: FW PbClBr / 6 x FW CoCBr6·H20 FW CoCBr6·H20 / FW PbClBr FW CoCBr6·H20 / 6 x FW PbClBr 6 x FW PbClBr / FW CoCBr6·H20