Which organ of the associated body system is missing? lungs, bronchioles, alveoli.

50 pts plz what is the physical state of matter of baking soda.

The excretory system,need answers for all: )

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.