Chapter 13 - The Chemistry of Solutes and Solutions - Problem Solving Practice 13.6 - Page 582: b

$10\,mL$

$c_{conc}=0.0750\,M$ $V_{dil}= 500\,mL$ $c_{dil}=0.00150\,M$ The relationship is $c_{conc}\times V_{conc}=c_{dil}\times V_{dil}$ $\implies$$ 0.0750\,M\times V_{conc}=0.00150\,M\times500\,mL$ Or $V_{conc}=\frac{0.00150\,M\times500\,mL}{0.0750\,M}=10\,mL$