The physical condensation method consists of obtaining dispersed systems through: Select one: O a. changing the solvent Ob. changing the speed of nucleus formation O C. changing the salt d. changing the precipitate O e. changing the reactions by reduction-oxidation
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- A. This is the equilibrium constant for the reactionin which a solid salt dissolves to give its constituent ions in Chemicalequilibrium constant Solubilityproduct constant Idealgas constant Noneof these B. Directprecipitimetry: Van’tHoff Method VolhardMethod MohrMethod Gay-LussacMethod C. Molecules which provide a group ofattachments used in Maskingagents Demaskingagents Ligands Chelatingagents D. Substances that determine the concentrationof a metal in the presence of another metal Maskingagents Demaskingagents Ligands Chelatingagents E. EDTAis an example of a: Masking agent Demaskingagent Ligand Chelatingagent For numbersF to H, identify the component of the chemical reaction: PO4-3 + H3O+ → HPO4-2 + H2O. Select from the following choices: Acid Base Conjugateacid Conjugatebase F. PO4-3 G. HPO4-2 H. H2O For numbers I to L, consider the given chemical equation: NH3(aq) + H2O(l) ↔ NH4+(aq) + OH-(aq) I Thechemical reaction from the given…1.1The Ksp of Ca3 (PO4 ) 2 is 1.3 × 10−26 . Estimate the solubility of this salt in units of g. L −1 . You must show any reaction equation(s) that you may think are necessary. 1.2 If a sample of solid Ca3(PO4)2 is stirred into exactly one litre of a 0.550M solution of Na3PO4, how will the solubility of the salt compare with the answer that you have obtained in question 1.1? Explain you answer in a short sentence.Write the balanced dissociation equation for solid potassium chlorate in aqueous solution. If it does not dissociate, simply write only NR. Be sure to include the proper phases for all species within the reaction.
- The equilibrium constant for the reaction 2CrO42(aq)+2H+(aq)Cr2O72(aq)+H2O is 31014 . What must the pH be so that the concentrations of chromate and dichromate ion are both 0.10 M?It is required to know the concentration of an aqueous solution of H2SO4 that appeared in the laboratoryChemistry III and it's unlabeled. To this end, a student of analytical chemistry carried out the followingProcedure: He took 5.00 mL of a fresh and standardized solution of 0.525M NaOH and brought them to a250.0 mL balloon to be completed with distilled water. Subsequently, he poured 15.00 mL of the solutionH2SO4 of unknown concentration in an Erlenmeyer flask and added 2 drops of phenolphthalein.Using a burette filled with the last NaOH solution, he noticed that when adding 39.40 mL of the hydroxidethe Erlenmeyer solution reached a faint but permanent pink. With the above dataDetermine the concentration and pH of the H2SO4 solution.In gravimetric analysis, co-precipitation occurs alongside with analyte precipitation,resulting in the introduction of impurity and excess mass. Occlusion and inclusion areamong the sources of impurities. Distinguish the difference between occlusion andinclusion and compare them using diagrams
- The equilibrium pressure of hydrogen H2 over solid uranium U and solid uranium hydride UH3 at 500 K is 139 Pa. Calculate the standard Gibbs energy of formation of UH3 (s) in the reaction: U(s) + 3/2 H2 (g) → UH3 (s) at 500 K. Hint: start with writing the equilibrium constant K expressed through activities that include pressure of gas. Examples are in class notes. Then, convert K to the standard Gibbs energy of the pertinent reaction.Assay of sodium nitrite is an example of assay under? Cerimetry Iodometry Permanganometry Iodimetry BrominimetryThe reaction A(g) + B(g) ↔ C(g) + D(g) has ΔGrxn° = -28.62 kJ mol-1 and Kp = 0.63 at 980 °C. A rigid cylinder at that temperature contains 1.2 atm of A, 0.20 atm of B, 0.30 atm of C, and 0.27 atm of D. What is the reaction Gibbs energy?
- Q: The concentration of the sulphate ion in a mineral water can be determinedby the turbidity which results from the addition of excess BaCl2, to a quantityof measured sample. A turbidometer used for this analysis has been standardisedwith a series of standard solutions of NaSO4. The following resultswere obtained:Standard solution Conc. (SO4)2− (mg/L) Reading of turbidometerS0 0.00 0.06S1 5.00 1.48S2 10.00 2.28S3 15.00 3.98S4 20.00 4.61i. In supposing that a linear relationship exists between the readings takenfrom the apparatus and the sulphur ion concentration, derive an equationrelating readings of the turbidometer and sulphate concentration(method of least squares).ii. Calculate the concentration of sulphate in a sample of mineral waterfor which the turbidometer gives a reading of 3.67.Solid silver chromate is added to pure water at 25 °C, and some of the solid remains undissolved. The mixture is stirred forseveral days to ensure that equilibrium is achieved between the undissolved Ag2CrO4(s) and the solution. Analysis of theequilibrated solution shows that its silver ion concentration is 1.3 x 10-4 M. Assuming that the Ag2CrO4 solution is saturatedand that there are no other important equilibria involving Ag+ or CrO42 - ions in the solution, calculate Ksp for this compound.Potassium dichromate has several industrial applications. To determine the purity of the salt that will be used in different industrial processes, a sample mass equal to 2.660 g was dissolved and quantitatively transferred to a 500.00 mL flask. An aliquot of 25.00 mL of this solution was treated with excess KI and the released iodine was titrated with 0.1000 mol L-1 sodium thiosulfate, spending 27.00 mL. Calculate the purity of the analyzed salt. Data:K = 39.10 O = 16.00 Cr = 52.00 I = 126.9 S = 32.07