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Teeth are made principally from the mineral hydroxyapatite, Ca5 (PO4)3OH, which can be dissolved in acidic solution such as that produced by bacteria in the mouth:
Ca5(PO4)3(OH) (s)+ 4H+(aq ) ? 5Ca2+(aq) + 3HPO42-( aq ) + H2O(l)
If at certain temperature, 0.100 g of Ca5(PO4) 3OH was dissolved in 23.68 mL of acidic solution and at equilibrium, [H+] = .0027 M, [Ca2+ ] = .008 M , and [HPO42-] = .0039 M, what is the Kc of the reaction?
An unknown solid mixture containing benzoic acid,copper(II)sulfate and sand. She added 15mL.of acetone to her sample. Which component of the mixture dissolved in the acetone?
At a distance of 41 ft an ionizing radiation source delivers 4.5 rem of radiation. How close could you get to the source and still have no biological effects?
10.0 L gas cylinder is filled with 5.20 moles of gas. The tank is stored at 1 C. What is the pressure in the tank?
What is the mass of silver bromide AgBr precipatated from 2.96 g of iron (III) bromide FeBr3 ? FeBr3 + AgNO3 = AgBr + Fe(NO3)3.
At 25ºC the solubility product constant, Ksp, for magnesium phosphate, Mg3(PO4)2, is 1.0´10-24. The solubility product constant for magnesium fluoride, MgF2, is 7.0´10-11.
Metal A was determined to be 95% extracted into methylene chloride with dethizone at pH6, when equal volumes of aqueous and non-aqueous solvents were used. what is the distribution ratio of A
The average concentration of strontium ion in seawater is 8.00 mg of strontium ion per kg of seawater. What is the molarity of the strontium ion if the density of the seawater is 1.025 g/mL.
When a strong base is added to a solution of CuSO4, which is pale blue, a precipitate forms and the solution above the precipitate is colorless. The net chemical equation is Cu(2+)(aq) + 2OH(-)(aq) --> Cu(OH)2(s)
Calculate the pH of this buffer solution after the addition of 0.010 moles of solid sodium hydroxide to the buffer
Partial pressures of SO2 and N2, 3.00 g of SO2(g) is originally in a 5.00 L vessel at 21 degrees Celsius and is transferred to a 10.0 L vessel at 26 degrees Celsius. 2.35 g N2(g) is originally in a 2.50 L vessel at 20 degrees Celsius and is transf..
You Have 500 mL of a buffer solution containing .2 M CH3COOH and .3 M CH3COONa. What will the pH of this solution be after the addition of 20 mL of 1.00 M NaOH solution? (Ka=1.8x10^-5)
a gasous mixture of oxygen and nitrogen contains 32.8% nitrogen by mass. what is the partial pressure of oxygen in the mixture if the total pressure is 405mmHG?
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