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A 25 mL sample of .147 M propionic acid, HC3H5O2, is titrated with .104 M KOH solution. The equivelence point is reached when 35.31 mL of KOH base has been added. What is the hydroxide ion concentration at the equivelence point? The Ka of propionic acid is 1.34 E -5.
1. Why was excess dry ice used in step 3 of the procedure? 2. Why do gas laws use degrees Kelvin rather than degrees Celsius? 3. Were you surprised at how accurately the mass of a molecule of CO 2 could be determined With such simple equipment?
At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g)
Explain the use of beta-alanine? Is it used as a H+ source, or something else? Why can malonic acid be reacted in V-D modification, while only its ester can be reacted in standard Knoevenagel condensation conditions?
A grad student made the news for all the WRONG reasons a few years ago when he synthesized a "nickel hydrazine perchlorate" compound (but didn't give any more detailed information) on a scale 1000 times larger than what his lab advisor told him to..
a sample of nitrogen gas occupies 1.55 L at 27.0 C and 1.00 atm pressure. What will the volume be -100 C and the same pressure?
What is the equilibrium concentration of hydronium ion in a solution that is 0.041 M in HF and 0.19 M in F1- ion.
Substituents on an aromatic ring can have several effects on electrophilic aromatic substitution reactions. Substituents can activate or deactivate the ring to substitution
Suppose that the microwave radiation has a wavelength of 10.7 cm. How many photons are required to heat 200. mL of coffee from 25°C to 65°C?
a student ran the following reaction in the laboratory at 736 kn2g 3 h2g 2 nh3gwhen she introduced 3.63e-2 moles of
Indium has only two naturally occurring isotopes. The mass of indium-113 is 112.9041 and the mass of indium-115 is 114.9039 .
A 326 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 640. mmHg. Calculate the moles of Ar present.
A catalyst decreases the activation energy of a particular exothermic reaction by 59 kJ/mol, to 51 kJ/mol. Assuming that the mechanism has only one step, and that the products are 94 kJ lower in energy than the reactants
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