Determine minimum pH for precipitate formation
What is the minimum pH at which aluminum hydroxide, Al(OH)3 will precipitate from a 0.020 M Al(NO3)3 solution. Consider activity effects. The Ksp for Al(OH)3 is 3x10^(-34). Assume the pH can be changed without increasing the solution volume.
Calculate the pH with the correct sig figs of.... a. A solution prepared by dissolving 2.55g (NH4)2SO4 (FW=132.141;Ka of NH4 = 5.7x10^-10)in 100.0 ml of water, adding 100 ml of 0.201 M NaOH, and diluting to 500.0 ml with water. b.H2C, is a weak diprotic acid with a Ka1=1.2X10^-3 and Ka2 = 8.9x10^-9. A 30.00 ml sample of ...continues
I have tried to play with all the numbers in this question but nothing seems to be working. Nitrite ion, NO-2 is used as a preservative for bacon and other foods. It has been the center of controversy it is potentially carcinogenic. Here is an abbreviated procedure for the determination: Step 1: To 50.0 mL of unknown ...continues
Calculate the pH with the correct sig figs of.... a. A solution prepared by dissolving 2.55g (NH4)2SO4 (FW=132.141;Ka of NH4 = 5.7x10^-10)in 100.0 ml of water, adding 100 ml of 0.201 M NaOH, and diluting to 500.0 ml with water.
calculate the pH of the solution formed during a titration upon adding 35.0 ml of a standard .150M NaOH solution to... a. 15.00 ml of .200 M CH3COOH Ka = 1.8 x 10^-5. b. 36.0 ml of .100 M malonic acid, (H2M) (Ka1 = 1.42 x 10^-3, ka2 = 2.01 x 10^-6
Lactic acid (CH3CHOHCO2H) and lactate ion (CH3CHOHCO2-) are of physiological and biochemical importance. What would be the pH of a 0.0973 M aqueous solution of sodium lactate ?
A red-colored complex PbX4 prepared from Pb with ligand X() shows promise as a means to determine trace levels of lead in the environment. The analyst prepares five standard solutions (A, B, C, D, and E) of PB: 30, 60, 90, 120, and 150 ppm, respectively. 5 ml of each solution is mixed with 5 ml of 0.10 M X. The transmittance of ...continues
An aromatic compound, RX, fluoresces at 470 nm (quantum yield = 0.1) after excitation at 340 nm. The molar absorptivity of RX at 340 nm is 1100. How much energy has been lost by non-radiative means or remains with the compound after it fluoresces at 470 nm? How many joules of energy per mole of 340 nm photons is retained by a ...continues
Reduction through constant current electrolysis
Reduction through constant current electrolysis a) How much Cr3+ was reduced to Cr2+? b) A few seconds after the electrolysis was stopped, the potential of the cell came to rest at -0.524 volts. How much Cr3+ actually remains in the solution? c) What was the original Cr3+ concentration?
Determining potential (in acid)
When VO2+ reacts with Ti2+ in acid solution the products are V2+ and TiO2+. a) What is the potential of the cell Pt/VO2+, V2+//TiO2+, Ti2+/Pt if all species are a 1 M . b) Write the equilibrium constant expression and calculate the value of the equilibrium constant.
