A 0.3205 g sample of CaCO3 was dissolved in HCl and the resulting solution was diluted to 250.00 mL in a volumetric flask.
From this volumetric flask, 25.0 mL solution was obtained and titrated against EDTA. A 18.75 ml of EDTA was utilized to reach the end point (Eriochrome Black T used as
the indicator)
Calculate the moles of CaCO3 used:
Hint: Moles = g/MW Use 20ca40 6C12 and 8016

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.