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Problem- You have 875 mL of an 0.51 M acetic acid solution. What volume (V) of 2.30 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.33? (The pKa of acetic acid is 4.76.)
Rework your solution from the beginning and check each step carefully.
calculate the molar mass of a sample if a simgle molecule weighs 8.90 x 10-23
Hydration of alkynes (via oxymercuration) gives good yields of single compounds only with symmetrical or terminal alkynes. Draw the major organic product(s) formed when hex-2-yne undergoes hydration in the presence of HgSO4 and H2SO4.
Problem- A polypeptide contains 3 lys and 2 arg residues (internal). Assuming cleavage was 100% efficient how many peptide fragments can be expected after cleavage with enzyme trypsin
The mass of the water in the inner bath is 1.60×10^3 g . The temperature of the calorimeter and its contents rises 2.84K as a result of this reaction. 1)Calculate the calorimeter constant.
The standard heat of formation \Delta H^\circ _{\rm f} is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard
Problem- The corona of the sun emits a spectral line at about 677 m due to the presence of an ionized 57Fe atom (molar mass of 0.0569 kg mol^-1). If the line has a width of 0.053 nm, what is the temperature of the corona.
How many moles of Ba and Cl are contained in 107.0g of Ba(ClO4)2•3H2O. How many molecules of water hydration are in this same amount
A second-order reaction has a rate constant , k, of 0.90 1/M.min. If the initial concentration of the reactant is 2.25 M , what will be the concentration of reactant after 10 minutes?
What is the nickel ion concentration in a solution prepared by mixing 389 mL of 0.428 M nickel nitrate with 467 mL of 0.323 M sodium hydroxide
Explain what is the formula of a compound that contains hydrogen as +1, sulfur as +4 and oxygen as -2? Define how to do this
Given that the present flux of anthropogenic Na+ into the oceans is 3.39 x 1012 mol yr-1, how long would it take to increase the concentration of Na+
Explain an acidic solution of permanganate ion reacts with oxalate ion to form carbon dioxide also Mn. State the balanced equation for the reaction.
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