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A corrosion technologist pipetted a 100.00 mL hard water sample and titrated it with 37.64 mL of 0.01 M EDTA solution for a total hardness endpoint, and 29.32 mL of 0.01 M EDTA solution for a calcium endpoint. Calculate the concentration of magnesium and calcium in ppm. Record your answers as ppm Mg2+, and Ca2+ espectively. For each answer indicate the ppm as CaCO3 also.
Draw a Lewis structure for H3C-NO2. Both oxygen atoms are directly attached to the nitrogen atom. If you take formal charge considerations into account, how many -bonds are in the molecule?
Decribe the preparation of the 100mL of a 50 mM acetate buffer at pH 5.5 beginning iwth sodium acetate and 1M acetic acid
what is the percent of magnesium in magnesium phosphate?
Aluminum chlorhydrate is added to antiperspirants to stop people from sweating. If this compound contains neutral H2O molecules and Al3+, OH- and Cl- ions, and the formula of this compound is Alx(OH)5Cl 2H2O, what is the value of x in this formula
For the following processes, calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic:
what is the structure of glycylserine and serylglycine?
The Ksp of zinc oxalate (ZnC2O4) at a given temperature is 7.87 x 10-9. Calculate the molar solubility at this temperature. Use E notation
if 37.0 grams of hydrogen sulfide gas h2s mm 34.08 gmol react with 37.1 grams of oxygen gas o2 mm 32.00 gmol what is
When an ion-selective electrode for X was immersed in 0.0740 M XCl, the measured potential was 0.0310 V. What is the concentration of X when the potential is 0.0460 V
how many grams of sodium chloride would be made if 507 g fecl2 were used up in the reaction fecl2 2naoh feoh2s 2nacl
an antifreeze solution prepared by mizing equal volumes of ethylene glycol, C2H6O2 (density 1.12g/cm^3) with water (density 1.00 g/cm^3). Estimate the freezing point of the mixture
at 30 km above the earths surface (roughly in the middle of the statosphere) the pressure is roughly 0.013 atm and the gas density is 3.74 x 10^23 molecules/m^3 assuming N2 is represetative of the stratosphere using the collisional diameter inform..
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