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If 1.0 liter of solution is to be made of a 0.010 M in Mg(NO3)2 and 0.10 M in aqueous ammonia, how many moles of NH4Cl are necessary to prevent the precipitation of magnesium hydroxide (neglect change in volume due to addition of NH4Cl)? The solubility product for Mg(OH)2 is 1.5× 10-11, and the Kb for ammonia is 1.8 × 10-5.
What is the limiting reactant when equal masses of iron(III) chloride and potassium phosphate react in solution?
A solution of 0.2113 g of water dissolved in 25.0 g of a solvent freezes at 11.5 °C below the freezing point of the solvent. What is Kf for this solvent?
As a demonstration, an instructor had a block of ice suspended between two chairs. She then hung a wire over the block of ice, with weights attached to the ends of the wire.
Calculate whether soils in the region are subject to excessive sulphate loading if the only source of sulphate is rainfall and if the recommended maximum is set at 20 Kg SO4-2 ha-1.
Write, using correct notation, the balanced nuclear reaction equation for each of the following:a. Electron capture by 93/43 Tc
Assume that you have carried out a radical chlorination reaction on (R)-2- chloropentane and have isolated (in low yield) 2,4-dichloropentane.
A dioxin-contaminated water source contains 0.081% dioxin by mass. How much dioxin is present in 4.2 L of this water? (Assume that the density of the solution is 1.01 g/mL.)
acetic acid has a Ka value of 1.8x10^-5. How many grams of NaC2H3O2 would have to be added to 100 ml of .1 M HC2H3O2 to prepare a buffer with a pH of 4.5?
Calculate the amount of N2 gas released (in liters at 37° C and 1.5 atm) when the diver returns to the surface of the water, where the partial pressure of N2 is 0.80 atm.
Write a balanced chemical reaction for photosynthesis (accounting for both the light and dark reactions). Compare the pathways of photosynthesis and oxidative phosphorylation.
How many grams of the K2C2O4XH2O in the salt mixture remain unreacted (in excess). What is the percent by mass of each salt in the mixture
a solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.3931 at 20 degrees celsius. The refractive indices at 20 degrees celsius of isobutyl bromide and isobutyl chloride
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