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At pH 12, magnesium hydroxide is insoluble and does not react with EDTA. The titration of a hard water sample at pH 12 thus yields results for calcium only. A 250.0-mL sample of tap water was adjusted to pH 12 and titrated with 0.01049 EDTA using calcein indicator, requiring 21.77 mL to reach the endpoint. A 200.0-mL sample of the same tap water required 47.86 mL of the standard EDTA for titration at pH 10 using calmagite indicator. Calculate the molar concentration of Mg2+ in the tap water.
the equilibrium constant, Kc, for this reaction is 4.6 x 10^-3. N2O4(g) 2NO2(g). if the equilibrium mixture contains .050 M NO2 what is[N2O4]
A patient's blood test shows that she has elevated levels of LDL (low density lipoproteins) at 4.12 mmol/L. Convert this concentration to units of molarity (mol/L).
Solutions A and B are separated by a semipermeable membrane that is permeable to K+, but not Cl-. Initially, Solution A is 0.5 L of 100 mM KCl, and Solution B is 0.5 L of 1 mM KCl.
Calculate the percentage of He atoms at 100oC which have speeds in the range between 1200 m/s and 1300 m/s. Calculate the percentage of these He atoms that have speeds greater than 5000 m/s
Find the equilibrium concentrations of A and B for a = 2 and b = 2. Assume that the initial concentration of A is 1.0 M and that no B is present at the beginning of the reaction.
how many g of A will be transferred to the new ether layer? (K remains the same, even though the number of g of A being partitioned is smaller. How many total g of A have been extracted into the two ether fractions?
0.90 g of hydrogen chloride (HCl) is dissolved in water to make 5.5 L of solution. What is the pH of the resulting hydrochloric acid solution?
Oleic acid has one double bond and a molar mass of 282.45 g/mol. If iodine number is equal to the number of grams of Iodine (1) that combines with 100 grams of a fat or oil substance; calculte the iodine number for Oleic acid.
What is the change in the boiling point of a solution made by dissolving 14.7 g of C6H12O6 into 150ml of water? The density of water is 1.00 g/ml and Kb=0.512 C/m .
optically pure compound was diluted to 800.0 mL with water and placed in a polarimeter tube 15.0 cm long. The measured rotation was -4.85° at 25 °C. Calculate the specific rotation of the compound
The work function for metallic rubidium is 2.09eV. Calculate the kinetic energy and the speed of electrons ejected by light with wavelength of (a) 650 nmand (b) 195nm.
according to equation, how many grams of Zn will remain after the reaction is complete? Equation [5] = CuSO4 (aq) + Zn (s) ----> ZnSO4 (aq) + Cu (s)
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