Solution
1mM= 0.001M
"Molarity=\\frac{50mM\\times{0.001}}{1mM}=0.05M"
"Moles of NaCl=\\frac{250ml\\times{0.05mol}}{1000ml}= 0.0125 moles"
"Mass of NaCl = 58.44g\/mol\\times0.0125= 0.7 g""Molarity of Na_2HP0_4"
"\\frac{10mM\\times{0.001M}}{1mM}=0.01M"
"Moles= \\frac{250\\times{0.01}}{1000}= 0.025moles"
"Mass of Na_2HPO_4= 358.057\\times 0.025 moles = 8.95 g"
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