You are about to perform some intricate electrical studies on single skeletal mu

Question

You are about to perform some intricate electrical studies on single skeletal muscle fibers from a gastronemius muscle. But first, you must prepare 6L of a 170 mM NaCl solution in which to bath the isolated muscle during your studies. How many grams of NaCl must you weigh out on the lab balance to prepare this bath solution? (hint: the molecular weight of NaCl is 58.44 grams/mole). You are about to perform some intricate electrical studies on single skeletal muscle fibers from a gastronemius muscle. But first, you must prepare 6L of a 170 mM NaCl solution in which to bath the isolated muscle during your studies. How many grams of NaCl must you weigh out on the lab balance to prepare this bath solution? (hint: the molecular weight of NaCl is 58.44 grams/mole).

Explanation / Answer

We need to prepare 6 L of 170 mM NaCl solution. Calculate the moles of NaCl present in 6 L of 170 mM solution as

Moles of NaCl = (6 L)*(170 mmoles/L) = 1020 mmoles = (1020 mmoles)*(1 mole/1000 mmoles) = 1.020 moles.

Molar mass of NaCl = 58.44 g/mole.

Therefore, mass of NaCl required = (1.020 mole)*(58.44 g/mol) = 58.6088 g 58.61 g (ans).

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