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If you add 0.35 g NaF to 150 mL of a 0.30 M HF, what is the pH of the resulting solution? (Will require Ka and Kb values.)
a)2.41
b) 3.15
c) 3.90
d) 4.21
e) 5.55
A standard l00-ppm quinine solution registered 125 when measured under conditions identical to those for the diluted sample. Calculate the mass in milligrams of quinine in the tablet.
How many grams of nitrogen dioxide (NO2) are required to produce 260 grams of nitrogen monoxide, NO?
when 35.6 L of ammonia and 40.5 L of oxygen gas at STP burn, nitrogen monoxide and water is produced. After the products return to STP how many grams of nitrogen monoxide is present.
What mass of sucrose should be combined with 541 of water to make a solution with an osmotic pressure of 8.30 at 295 ? (Assume the density of the solution to be equal to the density of the solvent.)
The selenite ion is an oxoanion of selenium bearing a negative two charge and containing three oxygen atoms. Write the formula for the selenite ion.
Which silver salt will precipitate first? Show calculations to support your answer. What is the concentration of Ag+ when the first precipitate begins to form?
does the HCl ionize the NH3 base? is the a conjugate acid or base, HCl is a strong acid, what happens when a strong acid and weak base are mixed?
A perfect sphere of aluminum metal with a diameter of 4.56x10^-2 m reacts with 3.80L of 5.25M hydrochloric acid. the products are an aluminum chloride solution and hydrogen gas.
Examination of the product mixture revealed that only about half of the starting material had been consumed and practically no PhCOCHBrCH3 was present. Explain these observations and draw the product that did form in the reaction.
Consider an experimental run at 273 rm K where the initial number of moles (n_1) is actually 1.00 rm mol, and the final number of moles (n_2) is 2.00 rm mol.
An aqueous solution containing 15.6 g of an unknown molecular (nonelectrolyte) compound in 109.5g of water was found to have a freezing point of -1.9 degrees C.
The same reactant decomposes with a half-life of 211 s when its initial concentration is 0.160 M. Determine the reaction order
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