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Which of the following solutions has the highest pH at 25?C?
1. 0.3 M hydrofluoric acid2. 0.5 M aniline3. pure water4. 0.1 M hypochlorous acid5. 0.1 M methylamine
In the formula for sodium phosphate (Na3PO4) how many moles of sodium are represented? How many moles of phosphorus? how many moles of oxygen?
The first thing you are asked to do in lab is record the ambient temperature. Why is it necessary to know the temperature
What is the pH change of a 0.300 M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.140 M with no change in volume?
Calculate ΔH° for the reaction -> 2 K(s) + 2 H2O(l) 2 KOH(aq) + H2(g) A 4.85-g chunk of potassium is dropped into 1.06 kg water at 24.0°C.
How long would you need to sample from a concentration of 1000 PPM using a flow rate of 50 ml/minute to collect 100 mg of material?
To prepare 5.0 L of a 3.50 M solution of Potassium Hydroxide (KOH), how many grams of Potassium Hydroxide must be used?
a dry gas, held at a constant temperature, occupies a volume of 24.8 mL at 725 torr. What will be the volume of the gas at 800 torr
How much energy (in Joules) is required to heat 14.89 g of water from 11.9 oC to 49.2 oC ? Use 4.184 J/goC as the specific heat capacity of water.
Calculate the mole fraction of ethylene glycol in the solution.
Calculate the molarity and the molality of an NH3 solution made up of 37.5 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL.
Obtain from a reference work the solubility of silver acetate at 20 degree C. Usually this will be reported in units of grams per 100 mL of water
In the combustion reaction of 149 g of propane with excess oxygen, what volume of carbon dioxide if produced at STP?
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