Quantitatively transfer the dissolved calcium carbonate solution to a 25 mL volumetric flask. Using a water bottle, add DI water to the volumetric flask until the volume reaches 25.00 mL. Safety First The pH 10 buffer is 10 M ammonia. Keep it under the fume hood as much as possible and avoid breathing its vapors. Wear your goggles! Hint Calculate the mass of disodium dihydrate (CAS 6381- 92-6) needed for the preparation of your stock EDTA solution. The molar mass of EDTA is 372.24 g/mol. EDTA Titrations 28 3. Transfer one 5.00 mL aliquot of the CaCO3 solution to a 125 mL or 250 mL Erlenmeyer flask.

Select the correct answer. which statement is true about a polarized object? o a. it gains electrons and becomes negatively charged. ob. it gains protons and becomes positively charged. oc. the number of positive and negative charges can be the same. od. it has to be a metal. o e. there is no change in the distribution of the charge in the object. reset next what

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

How does the atmosphere to make earth livable? check all that apply. causes the seasons contains oxygen provides warmth creates important nutrients blocks harmful energy from the sun plz like !