Question

patrick needs to make 100. ml of 0.15 m naoh in order to conduct an experiment. what mass of naoh would he need to add to the volumetric flask? ? g naoh

Explanation:

Step1: Recall the formula for molarity

Molarity ($M$) is defined as moles of solute ($n$) divided by volume of solution in liters ($V$), so $M=\frac{n}{V}$. We can rearrange this to find moles: $n = M\times V$.
First, convert the volume from milliliters to liters. The volume is 100. mL, and since 1 L = 1000 mL, $V=\frac{100.}{1000}=0.100\space L$.
The molarity $M = 0.15\space M$ (which is $\frac{mol}{L}$). So, $n=0.15\space \frac{mol}{L}\times0.100\space L = 0.015\space mol$.

Step2: Calculate the molar mass of NaOH

The molar mass of Na (sodium) is approximately 23 g/mol, O (oxygen) is 16 g/mol, and H (hydrogen) is 1 g/mol. So, for NaOH, molar mass $MM = 23 + 16+ 1=40\space g/mol$.

Step3: Find the mass using moles and molar mass

The formula for mass ($m$) is $m = n\times MM$. We have $n = 0.015\space mol$ and $MM = 40\space g/mol$. So, $m=0.015\space mol\times40\space g/mol = 0.60\space g$.

Answer:

0.60