A student wants to make a 0.100M solution with solid NaOH (s). Determine the mass of NaOH(s) required to make 250.0 mL of 0.100M NaOH(aq)
The student standardizes the NaOH(aq) she made by reacting it with solid oxalic acid, H₂C₂O₄. She property fills a buret with sodium hydroxide and makes a solution of oxalic acid in 250mL Erlenmeyer flask. In the flask the student dissolves 0.127g of solid oxalic acid in 10.0 mL of DI water. The reaction between NaOH and H₂C₂O₄ is shown below.
H₂C₂O₄(aq) + 2 NaOH(aq) ￫ Na₂C₂O₄(aq) + 2 H₂O(l)
Give the net-ionic reaction between the weak acid oxalic acid and the strong base sodium hydroxide.
Determine the initial moles of the oxalic acid.
The oxalic acid requires 29.2 mL of sodium hydroxide to reach equivalence. Determine the actual molarity of the sodium hydroxide solution.
The student determines that the reaction between oxalic acid and sodium hydroxide is an oxidation-reduction reaction. Is the student correct? Explain your reasoning.

1. they vary with a higher number because boiling is way hotter than melting

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

answer: mole of the gas

answer: mole of the gasexplanation: