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What mass of ammonium chloride should be added to 2.65 L of a 0.165 M NH3 in order to obtain a buffer with a pH of 9.60?
How many moles of bicarbonate ions, aluminum ions, and oxygen atoms are present in 26.0 g aluminum bicarbonate?
What will be the molarity of the resulting solutions made by mixing 140 mL of 3.2 M H3PO4 with 590 mL H2O?
a solution of 120 ml of 0.150 m koh is mixed with a solution of 280 ml of 0.250 m niso4. how many grams of the
When separating a solid-solid mixture in lab, do the melting points of the two components have to be 30 degrees apart, like with boiling points, to be considered pure, or is it a different range?
How many grams of Na2EDTA·2 H2O (FM 372.23) should be mixed with 2.07 g of Ca(NO3)2·2 H2O (FM 200.12) in a 500 mL volumetric flask to give a buffer with pCa2+ = 9.00 at pH 9.00?
The ionization constant, Ka, for benzoic acid, HC7H5O2, is 6.28 × 10-5. What is the pH of a 0.15 molar solution of this acid
A chemist must prepare 0.9 L of sodium hydroxide solution with a pH of 13.40 at 25 C. He will do this in three steps: Fill a 0.9 L volumetric flask about halfway with distilled water.
a sample of gas molecules has a temperature t1 and a root mean square velocity vrms1. a second sample of the same gas
The activation energy for the following first-order reaction is 318 kJ/mol. N2O5(g)-->2NO2(g)+(1/2) O2(g). The value of the rate constant (k) is 6.65x10^-5 s^-1 at 84 degrees C. What is the value of k at 49 degrees C. (R=8.314 J/mol K)?
How much heat energy, in kilojoules, is required to convert 73.0 g of ice at -18.0 0C to water at 25.0 0C ?
What would the pH of a raindrop be if the concentration of CO2 increases to 600 ppm at 20 degrees C? Show all steps.
Ethanol (CH3Ch2OH) the intoxicant in alcoholic beverages, is also used to make other organic compounds. In concentrated sulfuric acid, ethanol forms diethyl ether and water.
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