find molar mmass of substance using molality

Need to find how many moles of base we have.

(Conceptually: 1 Acid + 1 Base -> Salt + Water).

The question tells us its a 1:1 ratio of acid to base.

We have grams but we don't have moles of acid so we need to do an additional step before we can finish using the formula we identified in step 3.

Step 4: Plug and Chug (use your formula or figure out what additional steps need to be done before you can use the formula) Step 3: Find a formula (search for a formula that has your givens and goings in it)

Step 2: Find where you're going (this gives you an idea of what formulas to use. Volume Base: 15.0ml or 0.015L (always put units into base units to avoid issues).Step 1: Find your givens (so you can turn a word problem into a simple list) Calculate the molar mass of the unknown solid acid One mole of the acid reacts with one mole of the base. They neutralize the solid acid with 15.0ml of. 0250g of an unknown solid acid in an Erlenmeyer flask. If you are still troubled by those, I would be happy to elaborate.It is those seemingly unimportant details and definitions that may cause gaps in your learning :) I could elaborate, but based on this question, you are probably far enough along in coursework to understand some of the underlying concepts. If there is a 1:1 ratio of moles of acid and moles of base, then if I have the volume and molar mass of one and the mass of the other, I can convert to answer. When you divided out the 0.0250 g/0.00315 mol you were converting to _g/1 mole, thus 7.94g/1mole is further understood to be 7.94g/mole acid the mass per one mole of a substance (molar mass) *By converting, you now know that 0.0250 g per 0.00315 moles acid or 0.0250g/0.00315mol orħ.9365 g/mol acid-> 7.94 g/mole acid (using 3 as the maximum number of significant figures) *Since there was 0.00315 moles Base, there were 0.00315 moles Acid based on the 1:1 ratio stated *Since 1mole acid is neutralized by one mole of base, the 0.0250 g/MOLE of acid is completely *M to moles/L No work here, just the ability to recognize this relationship. *ml to L (base).the decimal should move 3 positions to the left.ġ5.0 ml is 0.0150 L Acid (do not drop the last 0.it was measured and therefore, significant) Metric: KHD(base)dcm if you go from left to right on this prefix line, Convert units so they are all compatible for your final answer: Mol can be converted to g given molar mass of the substanceģ. G can be converted to moles given molar mass of the substance (need name and periodic table)ġ mole of one will equal 1 mole of the other M is mol/L since Molarity is Moles of solute/liter of solution Relate the information-this part is the test to see if you understand the concept behind the math. _ g/mol unknown solid acid (molar mass is your mass per given moles)ġ mole of acid = 1 mole of base (this does not mean they will be the same mass.only that there willīe the same number of particles since 1 mole is 6.022x10^23 particles)Ģ. List all facts with proper units, labels and significant figures: It is good to use the same beginning strategy for all practical problems.ġ.

Find molar mmass of substance using molality