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    I need to answer this question for a strict teacher and i so lost and stressing about so could anybody help me..
    Question: When silicon tetrachloride is added to water, the following reaction happens
    SiCl4 (l) + 2H20 (l) -------> SiO2 (s) + 4HCl (aq)
    1.2g of impure silicon tetrachloride was dissolved in excess water, and the resulting solution was made up to 250cm^3. A 25cm^2 portion of the solution was then titrated against 0.10 moldm^-3 sodium hydroxide, and 18.7cm^3 of the alkali were required. What was the percentage purity of the silicon tetrachloride ?
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