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Q1 Write the formula and calculate the molar mass of KHP (KHP is not potassium hydrogen phosphorus).
Q2 When conducting this experiment, why is it necessary to standardize your NaOH solution before titrating your unknown acid?
Q3 Give an example of a triprotic acid other than H3PO4. Write a balanced chemical equation for the reaction of this acid with sodium hydroxide.
Q4 A 0.4281-g sample of KHP required 26.51 mL of sodium hydroxide solution to reach the phenolphthalein endpoint. Calculate the molarity of the NaOH solution.
Q5 31.88 mL of the NaOH solution standardized in question 4 was used to titrate 23.75 mL of a citric acid solution to the phenolphthalein endpoint. Calculate the molar concentration of the citric acid solution.
How many grams of ethylene glycol would be needed to prevent 4kg of water from freezing above -5.0 degress C
Write symbol for bromine.What is the atomic number of it in periodic table?How many protons and electrons are there in the atom of bromine?Give the highhest possible and minimal oxidation number for bromine.Determine its molar mass.
What is a meniscus? Why do some liquids develop a meniscus? How do we read the liquid level in a volumetric measuring device
What would be an appropriate reaction mechanism for these two reactions? Including electron transfer arrows.
Calculate the amount of heat energy required to convert 55.0 g of water at 62.5 degrees Celsius to steam at 124.0 degrees Celsius
Calculate the freezing point of 0.15m calcium chloride aqueous solution. Assume that the molal freezing point depression constant
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container Ais filled with air at STP, it is then inserted into a large enclosed container B, which is then flushed with H2(g), what will happen to the pessure inside container A? explain your answer.
Calculate the [SCN] solution A, where 5.3 mL of 1.9x10^-3 M NaSCN is diluted to 42.0 mL with 0.1 M Fe(NO3)3. Next calculate the [FeSCN2+] in the solutions prepared by diluting volumes of solution A with 0.1 M Fe(NO3)3 to a final volume of 1.0101 mL..
Radioactive isotopes often occur together in mixtures. Suppose a 190 sample contains , with a half-life of 12 days, and , with a half-life of 4.5 days. If there are initially twice as many calcium atoms as there are barium atoms, what will be the ..
Determine the total number of double bonds and/or rings for a hydrocarbon
The following reaction takes place in a sealed 40.0-L container at a temp of 120 degrees C 4NH 3(G) + 5 O2 (g) --> 4NO (g) + 6H2O (G)
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