Part significant figures You must write neatly- 1 will penalize you for sloppine

Question

Part significant figures You must write neatly- 1 will penalize you for sloppiness; this is a formal report 1. Numbers from the experiment: answers can be written in pen or pencil. You must show your work You must think about Realize that I have changed the amounts,equivalents, etc. from what was actually used in the experiment. flask as a (a) If you were supposed to add 3.50 mmol of thiamine hydrochloride to the reaction 2.00 M solution, describe how you would make the solution by filling in the blanks I would place1.18 grams of thiamine hydrochloride in a total volume of 1.75 3.5 mmol?1000el·3 ng-11.183 mL ofsolution. 1.75 mL (b) You next needto add 2.5 equ valents(relative to thiamine hydro chloride) of 15.0% sodium hydroxide solution to the reaction flask. How many moles of sodium hydroxide will you 3 (c) How many milliliters of 15.0% sodium hydroxide solution will you add? 1 wo 1000mmoI Salm (d) You need to add 8 equivalents of benzaldehyde (relative to thiamine hydrochloride) to the reaction mixture. How many milliliters of benzaldehyde did you add? (000 mpmai Tnel 044 2.85 mL 284lel (Page

Explanation / Answer

Answer C )

so the 15%NaOH solution means 15 g of NaOH added to 100 mL of water.

molarity = moles / volume of solution

moles of NaOH = 15 / 39.99 =0.3751 mole

molarity = 0.3751 / 0.1 L =3.751 M

so the volume of 15 % NaOH to add = moles / molarity

= (8.75 * 10^ -3 ) / 3.751

= 2.3327 * 10^-3 L

= 2.3327 mL

so the 2.3327 mL of 15% NaOH solution need to be added.

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