Question

Question 11 You use an analytical balance to measure the mass of a weigh boat and record a mass of 1.5624 g. You then add some NaHCO, to Not changed since the weigh boat and give the welgh boat to your lab partner to measure. Your lab partner mistakenly forgets to record all of the digits on the balance and records a mass of 1.92 g What is the minimum number of grams of acetic acid that you would need to fully react last attempt Points out of 0.4 with your NaHCO,7 Report your answer with appropriate sig figs and be sure to include units question Recall acetic acid and NaHCO, react in a 1-to-1 ratio. NaHCO, molar mass 84.007 g/mol Acetic acid molar mass 60.052 g/mol Answer Question 12 To calculate the pH of a solution, you take the H lon concentration in the solution and plug it into the following equation: pH- log(H), if the His 1.564 10, what is the pH of the corresponding solution? Report your answer with appropriate sig figs Not changed since ust attempt Poines out of 0.40 PRag Answer question Next

Answer 1

Ans 11 :

Mass of NaHCO3 = 1.92 g - 1.5624 g

= 0.36 g

Mol NaHCO3 = mass /molar mass

= 0.36 g / 84.007 g/mol

= 0.0043 mol

so mol acetic acid required = 0.0043 mol

Mass of acetic acid = mol x molar mass

= 0.0043 mol x 60.052 g/mol

= 0.26 g