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A student titrated a solution of 25 cm3 of NaOH of concentration 0.1 mol/dm3 with H2SO4. She achieved four results; 25.8 cm3, 26.15 cm3, 26.25 cm3 and 26.45 cm3. Calculate the concentration of H2SO4 using concordant titres.

H 2 SO 4 + 2NaOH → Na 2 SO 4 + 2H 2 O Concordant titres: 26.15 cm 3 and 26.25 cm 3 Mean titre: (26.15+26.25)/2= 26.2 cm 3 /1000= 0.0262 dm 3 moles of NaOH: (25/1000)*0.1= 0.0025 mol Ratio of H 2 SO 4 : NaOH=...
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Answered by Shimin S. • Chemistry tutor
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How many moles are there in 88g of carbon dioxide?

To work this out we need the equation: Number of moles = Mass (in grams) / Mr (relative formula mass) We know the mass of carbon dioxide already (88g). We need to work out the Mr of carbon dioxide. The Mr ca...
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Answered by Archie A. • Chemistry tutor
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What and where are alkali metals in periodic table? Explain reactivity trends.

Alkali metal have 1 outer electrons. Reactivity increases down the coloumn.
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Answered by Sandeep T. • Chemistry tutor
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How are elements in the modern periodic table arranged?

Elements are arranged in rows, referred to as periods, of increasing atomic number. To recap, atomic number is the number of protons in the nucleus of an atom. Elements are also arranged in columns, referred...
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Answered by Alex G. • Chemistry tutor
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Why do skeletal formulae not show the hydrogens bonded to carbons but do on other elements?

Because carbon atoms have 4 electrons in their outer shell so always form 4 covalent bonds in a molecule, so the number of hydrogen atoms bonded can be inferred by subtracting however many bonds the carbon i...
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Answered by Megan A. • Chemistry tutor
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