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Trimethylamine (C3H9N) is a weak base (pKb = 4.19) with a fishy odour. In a titration of 250.0 mL of aqueous trimethylamine solution, 23.6 mL of 0.974 M HCl was required to reach the equivalence point.
a) Calculate the pH of the solution at the equivalence point of the titration.
b) Briefly explain which indicator, bromocresol purple (pKa = 6.3; from yellow to purple) or thymolphthalein (pKa= 10.0; from colourless to blue), would be better for use in this titration
NH3 is a weak base (Kb = 1.8 × 10-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.080 M in NH4Cl
On a TLC plate if two compounds have Rf values of .50 and .61, how far will they be separated from each other on a plate
Complete combustion of 3.90 g of a hydrocarbon produced 12.0 g of CO2 and 5.54 g of H2O. What is the empirical formula for the hydrocarbon?
Given data:moles of H2=0.001mole , given weight of the unknown metal(M)=0.0757 g given equation:M(s)+nH30^+1........>M^(+n)+ (n/2) H2 + nH2O from the stoichiometry of the reaction and the number of moles of H2 given, Calculate the number of moles ..
A solution of 75.0 g of benzene (C6H6) and 75.0 g of toluene (C7H8) has a total vapor pressure of 80.9 mmHg at 303 K. Another solution of 100.0 g benzene and 50.0 g toluene has a total vapor pressure of 93.9 mmHg at this temperature.c
Suppose a sample of solid hydrogen is held under an external pressure of 0.030 atm and heated from 5 to 300 K. What phase change(s), if any, will occur?
in a gas mixture the partial pressures are argon 455 neon 80 and nitrogen 175 .what is the total pressure exerted by
The nitrix oxide molecule, NO,readily loses one electron to form the NO+ ion. Why is this consistent with the electronic structure of NO. Predict the order of the N-O bond strengths in NO, NO+ and NO- and describe the magnetic properties of each.
If in an experiment 42g of CO is burned with excess oxygen gas. Calculate how many grams of CO2 will be formed in the process.
A radio station's channel, such as 100.7 FM or 92.3 FM, is actually its frequency in megahertz (MHz), where 1MHz=10^6 Hz. Calculate the broadcast wavelength of the radio station 99.10 FM.
Given that the delta H of vaporization = 35.00 kj/mol and delta H of sublimation= 40.00 kj/mol, calculate the triple point of this material. this compound melts at 170.0 k to 270.0 k temperature.
What are the equations illustrate the diazotiation of aniline and subsequent reaction with phenol; with dimethylaniline
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