Why do we need to measure time ??

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Determine the reaction and balance the following equations urgent due in the morning

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.