FrontierScience / adadda00-bef8-417d-97d6-cfd9dec33cba / A sample solution is made from a mixture of 100mL of 15.0M ammonia `NH₃` and 100mL of 4.00M citric acid `C₆H₈O₇` solution with 0.1 mol of magnesium oxide `MgO`. 1.00mL of this samp…

A sample solution is made from a mixture of 100mL of 15.0M ammonia `NH₃`  and 100mL of 4.00M citric acid `C₆H₈O₇` solution with 0.1 mol of magnesium oxide `MgO`. 1.00mL of this sample solution is mixed with 9.00mL of sodium phosphate `Na₃PO₄` solution to form a test solution. A magnesium ammonium phosphate `MgNH₄PO₄`  precipitate of mass 6.00mg forms and the test solution has a final pH of 8.50. What is the concentration (M) of magnesium ions `Mg^(2+)`  remaining in the test solution, rounded to three significant figures.

Think step by step and solve the problem below. At the end of your response, write your final answer on a new line starting with “FINAL ANSWER”. It should be an answer to the question such as providing a number, mathematical expression, formula, or entity name, without any extra commentary or providing multiple answer attempts.

A sample solution is made from a mixture of 100mL of 15.0M ammonia `\( NH_3 \)`  and 100mL of 4.00M citric acid `\( C_6H_8O_7  \)` solution with 0.1 mol of magnesium oxide `\( MgO \)`. 1.00mL of this sample solution is mixed with 9.00mL of sodium phosphate `\( Na_3PO_4 \)` solution to form a test solution. A magnesium ammonium phosphate `\( MgNH_4PO_4 \)`  precipitate of mass 6.00mg forms and the test solution has a final pH of 8.50. What is the concentration (M) of magnesium ions `\( Mg^{2+} \)`  remaining in the test solution, rounded to three significant figures.

Think step by step and solve the problem below. At the end of your response, write your final answer on a new line starting with “FINAL ANSWER”. It should be an answer to the question such as providing a number, mathematical expression, formula, or entity name, without any extra commentary or providing multiple answer attempts.