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Let HA represent a weak monoprotic acid with Ka=1.0x10^-4 at 25oC. Add HCl or NaOH to 1.00 L of 1.00 mol L-1 HA(aq) to obtain a solution with a pH of 4.00 at 25oC? How many moles of HCl or NaOH are required?
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Insoluble PbBr2(s) precipitates when solutions of Pb(NO3)2(aq) and NaBr(aq) are mixed. Pb(NO3)2(aq) + 2NaBr(aq) ---> PbBr2(s) + 2NaNO3(aq) ΔrH = ? To measure the enthalpy change, 350. mL of 0.50 M Pb(NO3)2(aq) and 350. ...
Consider the following reaction. A (g) + B (g) → C (g) + D (g) *In one experiment the concentration of A (g) was monitored in the presence of a large excess of B (g) ( [B] o = 0.750 M ) . Time (s) [A] (mol/L) 0.00 6.00 ...
PROTEIN FOLDING ASSIGNMENT In an "in vitro" protein folding experiment monitored by fluorescence measurements the following data was obtained for protein X: [GuHCl], M Wavelength Maxima, nm 0 330 0.5 332 1.0 331 1.5 332 ...
How is vacuum filtration completing the purification of your sample? Where are the impurities at this point? For a recrystallization lab in organic chemistry
The Earth receives radiation from the Sun at the top of the atmosphere with a spectrum that resembles a blackbody emitter at a temperature of nearly 6000 K, although the temperature inside the Sun is about 15 million K. ...
Give an example of when heat is released from water as it undergoes a change of phase.
A solution has a concentration of 10.0 m and contains 5.0 g NH3. What is the volume (in milliliters) of this solution
2 H2S(g) + 3 O2(g) → 2 H2O(g) + 2 SO2(g) Using standard enthalpies of formation, calculate the standard enthalpy change for this reaction.
Silver nitrate has the molecular formula AgNO3. In a 109.0 g sample of silver nitrate, how much of that mass (in g) is from the silver atoms?
Label each of the following phase changes as either exothermic or endothermic. i. H 2 O( s ) + heat H 2 O( l ) (1 point) ii. H 2 O( g ) H 2 O( l ) + heat (1 point)
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