B. Since 1993 the World Health Organization (WHO) has maintained that the smallest maximum allowable level of lead in drinking water is 5µg/L. A colleague of yours is collecting samples from the drinking water supply in a foreign country and is using an electrochemical technique to determine the amount of Pb2+ cations in the water. He set up an electrochemical cell of 1 L (liter) in volume and used the water sample containing Pb²+ cations to electroplate Pb on to an inert gold cathode. The electroplating was completed in 1 week. Then he stripped the metallic Pb from the gold surface and measured a charge under the stripping curve of 3.71 x 10-³ coulombs. 1. According to the WHO, is the water safe to drink? Show all work. Page 4 of 4 2. Could you experimentally determine if the water is safe to drink by setting up a different electrochemical cell? This involves using a Pb wire and a suitable reference electrode and measuring the equilibrium potential of the Pb wire and the dissolved Pb²+ cations in the water sample? write a few sentences fully explaining your thoughts.

Please put the right number of significant figures

A chemist prepares a solution of silver(I) nitrate (AGNO,) by measuring out 413. umol of silver(I) nitrate into a 400. mL volumetric flask and filling the f the mark with water. Calculate the concentration in umol/L of the chemist's silver(I) nitrate solution. Round your answer to 3 significant digits. u mol Continue Su

I am allowed to work with someone I just don’t understand this Using the Volumetric Pipet Data from Part C calculate the

1.) Convert 21.37 mL to L. Final answer into scientific notation 2.) How many years in 1 billion (1x10⁹) seconds?

This is not graded! It is strictly for practice. Do questions 1-5.