There are several steps that are important in ensuring that the maximum amount of precipitate is obtained, that interferences are eliminated, and accurate measurements/results are obtained. Suggest two (2) of these steps and discuss how they could be done.
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There are several steps that are important in ensuring that the maximum amount of precipitate is obtained, that interferences are eliminated, and accurate measurements/results are obtained. Suggest two (2) of these steps and discuss how they could be done.
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- identify each sample by matching the respective solubility profile with the given structures. Give the Identity and Rationalization.a sodium chloride/ calcium chloride mixture was found to produce 0.16g of precipitate after dissolving in 60mL. A reference if 0.4h of calcium chloride in 60mL produced a precipitate with a percent yield of 73%. What would be the mass of calcium chloride in the mixture?Predict three (3) correct apparatus used for the procedures experiment run by a chemist below. Determination of phosphorus in plant food will produced magnesium ammonium phosphate, MgNH4PO4.6H2O, precipitate. The precipitate was kept in a crucible and dry at 130 °C for 2 hours. Then, the precipitate was cooled for 15 minutes in a condition of low moisture atmosphere. The precipitate is weighed until constant weight is obtained.
- (a) If the molar solubility of YF, at 25 °C is 4.23e-06 mol/L, what is the Kep at this temperature? Ksp (b) It is found that 5.73e-05 g of Znj(AsO4)2 dissolves per 100 mL of aqueous solution at 25 °C. Calculate the solubility product constant for Zn (ASO4)2- Kap- (c) The Kap of ZnCO, at 25 °C is 1.46e-10. What is the molar solubility of ZnCO₂? solubility mol/L(a) In 20 or less of yourown words define the term “leachate”and describe how it forms. (b) Previous records had shown that to prevent acute toxicity to organisms, the maximum mass of CdSO4 that should be allowed into the landfill was determined to be 0.1 kg. This was calculated using a standard concentration of Cd in mg/L where the volume of the leachate pond was used as 500 000L. (i) Provide the name of the CdSO4 compound. State the oxidation number of Cd in this compound (ii) You need to ensure that the concentration used to determine the mass of Cd allowed in the landfill, meets the current regulatory standard. Assuming that previous calculations determined that all of the CdSO4 would be deposited in the leachate pond, what standard concentration of Cd in mg/L was used to determine the maximum mass of allowable CdSO4?Caustic potash that has been exposed to air is found on analysis to contain 90.00% KOH, 2.38% K2CO3 and 7.62% H2O. What weight of residue will be obtained if 1.00 g of this sample is added to 46.00 mL of 1.00 N HCl and the resulting solution, after neutralization with 1.070N KOH is evaporated to dryness?
- A 600.0 mg sample consist only of CaC2O4 and MgC2O4 was heated at 500°C converting the two salts to CaCO3 and MgCO3. The resulting precipitate weighed 465.0 mg. If the sample had been heated at 900°C, the products would be CaO and MgO, what would the mixture of oxides weigh? (FW: CaC2O4=128.1; MgC2O4=112.3; CaCO3=100.1; MgCO3=84.31; CaO=56.08; MgO=40.31)One of the possible consequences of climate change is anincrease in the temperature of ocean water. The oceansserve as a “sink” for CO2 by dissolving large amounts of it.(a) The figure below shows the solubility of CO2 in water as a function of temperature. Does CO2 behave more or lesssimilarly to other gases in this respect?(b) What are the implications of this figure for the problemof climate change?(a) Adsorption of a gas on surface of solid is generally accompanied by a decrease in entropy, still it is a spontaneous process. Explain.(b) Some substances can act both as colloids ’ and crystalloids. Explain.(c) What will be the charge on Agl colloidal particles when it is prepared by adding small amount of AgNO3 solution to KI solution in water ? What is responsible for the development of this charge ?
- Calculate the masses of oxygen and nitrogen that are dissolved in 1.5 L of aqueous solution in equilibrium with air at 25 °C and 760 Torr. Assume that air is 21% oxygen and 78% nitrogen by volume. (See attached picture).A 10.00 ml sample with an unknown concentration of KNO3 was studied at 60° C. If an additional 2.4 g of KNO, were added to reach saturation. What was initial concentration of Q3 KNO, in M.(a) If the molar solubility of Nd₂(CO3)3 at 25 °C is 1.00e-07 mol/L, what is the Ksp at this temperature? Ksp = (b) It is found that 8.90e-06 g of Y₂(CO3)3 dissolves per 100 mL of aqueous solution at 25 °C. Calculate the solubility- product constant for Y₂(CO3)3. Ksp = (c) The Ksp of Ag₂C₂04 at 25 °C is 5.40e-12. What is the molar solubility of Ag2C₂04? solubility mol/L