Phosphoric acid is a triprotic acid with the following pK, values pK -2.148 pK 7.198 pK-12375 You wish to prepare 1.000 L of a 0.0300 M phosphate buffer at pH 7.560. To do this, you choose to mix the two salt forms involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture? Number Number Nah, Po,-D gl mass Na,HPO,-IL ina ss

Calculate the number of grams of CaCO3 present and convert to mg. (enter your answer with 3 significant figures)

In doing the experiment, a student calculated the mass of chlorine in the compound to be 1.133 g.  How many moles (mol) of chlorine are in the compound? Include the unit and five decimal places in your answer.

Although the standard of mass is, strictly speaking,the kilogram, in chemistry we more commonly makemeasurements of mass in terms of how many______ a sample weighs. Explain.

Give detailed Solution

A 0.790 gram sample of copper is carried through the steps of an experiment. At the completion of the last step of the experiment, 0.314 grams of copper are recovered. What is the percent recovery of the copper metal? Give your answer in in decimal format.

What is the mass of 3.90 x 1021 formula units of KBr? Answer in standard notation to three significant figures.

Water has a density of 1.00g/mL. How many teaspoons of water are represented by 40,500 molecules of water. Use dimensional analysis.

1) State your interpretation of the meaning of the slope for the first graph you prepared of Volume of Steel Nuts (mL) versus Number of Steel Nuts. Hint: Understanding the meaning of a slope involves several factors: the units which are a ratio of the y axis units over the x axis units, the interpretation of the slope as “number of the y axis units for every one of the x axis units” and the concept that constructing the best line or curve that follows the trend in the data is a sort of averaging of the random error throughout the data.

Ocean water contains 3.5  %   NaCl  by mass. What mass of ocean water in grams contains 48.8  g  of  NaCl ?        Express your answer in grams to two significant figures.