A \( 0.141 \mathrm{~g} \) sample of a phosphorus containing compound was digested in a mixture o....

Channel:
PW Solutions
Subscribers:
456,000
Published on ● Video Link: https://www.youtube.com/watch?v=PzldZynlAI4


Duration: 6:21
0 views
0

A \( 0.141 \mathrm{~g} \) sample of a phosphorus containing compound was digested in a mixture of \( \mathrm{HNO}_{3} \) and \( \mathrm{H}_{2} \mathrm{SO}_{4} \) which resulted in formation of \( \mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O} \) and \( \mathrm{H}_{3} \mathrm{PO}_{4} \). Addition of ammonium molybdate yielded a solid having the composition \( \left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4} .12 \mathrm{MoO}_{3} \). The precipitate was filtered, washed and dissolved in \( 50.0 \mathrm{~mL} \) of \( 0.20 \mathrm{M} \mathrm{NaOH} \) :
\[
\begin{array}{l}
\left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4} \cdot 12 \mathrm{MoO}_{3(\mathrm{~s})}+26 \mathrm{OH}^{-} \rightarrow \\
\mathrm{HPO}_{4}^{2-}+12 \mathrm{MoO}_{4}^{2-}+14 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{NH}_{3(\mathrm{~g})}
\end{array}
\]

After boiling the solution to remove the \( \mathrm{NH}_{3} \), the excess \( \mathrm{NaOH} \) was titrated with \( 14.1 \mathrm{~mL} \) of \( 0.174 \mathrm{M} \mathrm{HCl} \).

The percent of phosphorous in the given sample is:
(1) 3.36
(2) 5.56
(3) 6.38
(4) 7.25


📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2024-01-21\( \sin (A \pm B)=\sin A \cos B \pm \cos A \sin B \) and \( \cos (A \) \( \pm \mathrm{B})=\cos \....
2024-01-21Consider the statements about \( y \frac{\sin 3 x}{\sin x}(\sin x \neq 0) \). Which of the follo....
2024-01-21\( \mathrm{Li} \) does not resemble with other alkali metals in following properties:....
2024-01-21If \( \mathrm{A}=\tan 6^{\circ} \tan 42^{\circ} \) and \( \mathrm{B}=\cot 66^{\circ} \cot 78^{\c....
2024-01-21The minimum value of \( \frac{\sec ^{4} \alpha}{\tan ^{2} \beta}+\frac{\sec ^{4} \beta}{\tan ^{2....
2024-01-21If \( \cos 5 \theta=a \cos \theta+b \cos ^{3} \theta+c \cos ^{5} \theta+d \), then....
2024-01-21\( \sqrt{3} \sin \frac{\pi}{9}\left(4+\sec \frac{\pi}{9}\right) \) is equal to....
2024-01-21The value of expression \( \sum_{\theta=0}^{8} \frac{1}{1+\tan ^{3}(10 \theta)^{\circ}} \) is eq....
2024-01-21Match the stoichiometric coefficients in column I with the species in column II and involved in ....
2024-01-21If \( \sin x+\sin ^{2} x=1 \), then the value of \( \cos ^{2} x+\cos ^{4} x \) is....
2024-01-21A \( 0.141 \mathrm{~g} \) sample of a phosphorus containing compound was digested in a mixture o....
2024-01-21Match the column-I with column-II \begin{tabular}{|l|l|l|l|} \hline \multicolumn{2}{|c|}{\begin{....
2024-01-21The oxidation number of \( \mathrm{Mn} \) in the product of alkaline oxidative fusion of \( \mat....
2024-01-21If \( \tan \alpha, \tan \beta \) are the roots of the equation \( \mathrm{x} 2+\mathrm{px}+ \) \....
2024-01-21Match the following \begin{tabular}{|l|ll|l|l|} \hline \multicolumn{3}{|c|}{ Column-I } & \multi....
2024-01-21A \( 0.141 \mathrm{~g} \) sample of a phosphorus containing compound was digested in a mixture o....
2024-01-21Which is/are correct statements about the following reaction? \[ \begin{array}{l} \mathrm{KMnO}_....
2024-01-21\begin{tabular}{|l|l|l|l|} \hline \multicolumn{2}{|c|}{\begin{tabular}{c} List -I \\ (Given func....
2024-01-21If \( e^{f(x)}=\frac{10+x}{10-x}, x \in(-10,10) \) and \( f(x)=k f\left(\frac{200 x}{100+x^{2}}\....
2024-01-21Exact value of \( \sec 10^{\circ}-\tan 10^{\circ}-\tan 40^{\circ} \) is equal to....
2024-01-21If \( \mathrm{A} \) and \( \mathrm{B} \) are complimentary angles, then....