A 25.0 cm portion of 0.200, mol dm^-3 sodium ethanedioate solution was warmed and titrated against a solution of potassium manganate(VII). If 17.2 cm^3 of potassium manganate(VII) are required, what is its concentration?
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- Potassium acid phthalate, KHC8H4O4 ( MM=204.2 ), reacts with sodium hydroxide on a 1:1 molar basis. A sample of the acid weighing 0.4823 g was titrated with NaOH, requiring 24.35 mL to reach the endpoint. Calculate the molar concentration of the sodium hydroxide solution.Calculate the ionic strength of a solution that is 0.040 mol kg−1 in K3[Fe(CN)6](aq), 0.030 mol kg−1 in KCl(aq), and 0.050 mol kg−1 in NaBr(aq).How do you find the solubility constant for Al(OH)3, MnS, and Ca3(PO4)2?
- The solubility of borax, which is made up of sodium tetraborate (Na2B4O5(OH)4 8H2O), was analyzed. The dissolution of borax is: Na2B4O5(OH)4 • 8H2O(s) ⇌ 2 Na+(aq) + B4O5(OH)42–(aq) + 8 H2O(l) A 50 mL saturated solution was prepared. After filtration of solution, 5 mL aliquot was transferred to a flask and titrated using 0.432 M HCl. The endpoint was found to be 4.73 mL of the titrant. Tetraborate anion (B4O5(OH)42-) is a weak base which reacts with HCl like the following reaction: B4O5(OH)42–(aq) + 2 H+(aq) + 3 H2O(l) ⇌ 4 H3BO3(aq) What is Ksp expression for the dissolution? What is the tetraborate ions concentration in the filtrate? What is the molar solubility and Ksp of borax if the titration was done at room temperature (298 K)?What is the pH of a 0,0100 mol.dm–3 solution of a weak, monoprotic acid with Ka = 3,4 x10^-3 at 25ºC?What would be the KPs value of Al(OH)3, considering that its solubility is 2,5 x 10^-8 mol/L?
- In the volumetric analysis of a 0.5000g sample of a silver coin containing 90.00% Ag, what is the least normality that a KSCN solution may have and not require more than 10.00mL of it in the titration of the Ag?As part of the analysis of water samples, the hardness of water is commonly measured and calculated. It is commonly expressed in ppm by mass (parts per million) of CaCO3. Parts per million is also equivalent to milligrams of CACO3 per liter of water. In a sample taken by an environmentalist, he was able to observe a hardness count of 205 mg CacO3/L. Given this hardness count of the sample, what is the molar concentration of Ca2+ ions in the water sample?Please explain how the relationship S = 0.330(Ksp)^(1/5) was derivedto calculate the solubility (S) of cerium(IV) ions in a saturated solution of cerium(IV) fluoride, CeF4.
- write out the equilibrium expression for the mineral dissolution of Al(OH)3 in waterIf 25,0 cm3 of the NH3 (concentration 0,10 mol∙dm–3) is titrated with the HCl (concentration 0,050 mol∙dm–3), calculate the pH at the equivalence point of the titrationCalculate the concentration of copper ion in a saturated solution of copper oxalate at 25 ℃. Ksp of CuC2O4 is 4.4 x 10-10.