Why do scientists need scientific models? they can often be used to make predictions. once established, they become fairly rigid and rarely change over time. they exactly present the scientific principle being demonstrated. they are typically based on mathematical explanations.

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.