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1. A buffer system contains 0.18 MNH4+ and 0.14 M NH3. pKa of NH4+ is 9.25. How many moles of NaOH must be added to 1.00 L of this solution to increase the pH to 9.25?
2. Titration of a 15.0 mL solution of KOH requires 17.0 mL of 0.0250 M H2SO4 solution. What is the molarity of the KOH solution?
3. A 0.22 M solution of HCl is used to titrate 35.0 mL of a Ca(OH)2 solution of unknown concentration. If 140 mL of HCl is required, what is the concentration (in molarity) of the Ca(OH)2 solution?
in the electroysis of an aqueous solution agno3nbsp0.67gof agis deposited after a certain period of time. what is the
classify each solute represented in the following equations as a strong, weak, or nonelectrolyte: a)CH3-OH(l) H2O> CH3-OH(aq). b)MgCl2(s) H2O> Mg2+(aq) + 2Cl-(aq). c) HClO(aq) H+(aq) + ClO-(aq)
Rank the compounds(acetone,butane,acetic acid, 2-propanol, 2-methylpropane, 1-propanol) by vapor pressure, label the one that has the lowest vapor pressure and the one that has the highest.
After experiment 20.09 gram anodic solution contained 0.06227 gram silver nitrate at same time 0.009479 gm Cu was deposited in copper coulometer placed in series. Calculate the transport number of silver and nitrate ions
A snack pack of potato chips holds 28 grams of chips. Based on your data, how much fat is present in a snack pack? In such a bag of chips, there are about 15 grams of carbohydrate and about 1 gram of protein.
There is a difference between the hamiltonian operator for a particle on a line model as well as the harmonic oscillator model. Explain what is this difference and why does this difference occur
State the Lewis structure prepare a VSEPR sketch explain the geometry prepare a VB sketch and describe the bonding in the altene molecule H2CCCH2
The acid dissociation constant (Ka) of caffeineH+ is Ka = 0.25 M. If a cup of tea has a pH of 7.6, what should be the ratio of concentrations of caffeineH+ to unprotonated caffeine in the tea
If an increase in global temperatures were to cause a melting of the polar ice gaps, which of the following best describes the effect this will have on global warming
A sample of 30.0 ml of krypton gas, Kr, is at 756 mm Hg and 25.0 degree celsius. What is the new volume if the pressure is decreased to 325 mm Hg and the temperature is decreased to -12.5 degree celsius?
Concentration of NADH was found by using beer's law using 6.22 mM cm-1 as extinction coefficient. Concentration of NADH = .0212 mM. Moles of NADH that are present in 1.02 mL sample was found by : .0212 mM x 1.02 mL = .021624 mM/mL
A set of two gas bulbs, with volumes of 500 mL and 300 mL, are connected by a closed stopcock. The 500 mL bulb contains 450 torr of Ne gas, and the 300 mL bulb contains 150 torr of Cl2 gas
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