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1. A solid mixture may contain AgNO3, NiSO4, KCl, and Ca(NO3)2. Treatment of the solid with water leaves a white insoluble residue. The water soluble portion is colorless and gives a precipitate when treated with 1 M Na2CO3. Identify the components of the mixture.
2. Which of the acids that can be used to dissolve an alloy (i.e., mixture of metals) produces the largest number of volatile compounds containing cations of the qualitative analysis scheme?
3. Which compound of silver is the least soluble in both water and dilute strong acid?
4. Identify the cation and anion. Express the answer in terms of the formula of the salt. A green powder dissolves in water and gives a pure white precipitate with acidic AgNO3. When the solution is heated with H2O2 and NaOH, it turns a yellow color, which changes to orange in acid.
5. Consider the following mixture; FePO4 and AlCl3. Would it dissolve completely in water? Would it dissolve in 6 M HNO3 but not in water? Would it dissolve in 6 M NaOH? Would it dissolve in 6 M NH3?
What is the density (in grams per liter) of a gas mixture that contains 26.0 % F_2 and 74.0 % He by volume at 743 mm Hg and 28.5 C?
Calculate the molar mass of the compound if given that normal freezing point of C6H6 = 5.5 oC , the freezing point depression constant for C 6 H 6 = -5.12 o C/m .
What experimental difficulty would you encounter if you had neglected to include a drying step before evaporation
Why are the mobile phases added in order of increasing polarity rather than in the order of decreasing polarity?
Draw the Fischer projection of the enantiomer of (4S, 5S)-5-sec-butyl-4-(1,1-difluoromethyl)nonane
How much entropy does this produce per hour in the surroundings at 25.4 °C? Assume the heat transfer is reversible.
If the average human body discharges 925.0g CO2 per day, how many moles of NaOHare needed each day for each person in the spacecraft?( 42.04 mol NaOH)
0.01M HCl reacts with 3.18 g Na2CO3. Here 50 mL of HCl is required for the reaction. Calculate the volume of CO2 produced at 273 K and 1 atm.
Calculate the standard reduction potential and standard apparent free energy change for the transfer of a pair of electrons from FADH2 to 1/2O2. Show all calculations.
1. Gasoline (assumed to be 100% octane) is combusted in your car according to the following chemical reaction: 2 C8H18 + 25 O2 -> 16 CO2 + 18 H2O
Calculate pH and the concentration of acetate ion resulting from the mixtureof 400ml of 0.1M formic acid and 100ml 0.1 sodium acetate.
The protons that give rise to the signal at 7 ppm are more shielded than the protons that give rise to the signal at 9 ppm. B) The protons that give rise to the signal at 7 ppm are less shielded than the protons that give rise to the signal at 9 p..
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